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I'm currently running a fever so my mind is not 100%. Unfortunantely I'll be away from my books for a while starting tomorrow otherwise I would have loved to dwelve deep into this thread.

Now the first question is where it states that there's 32.000 hive Worlds in the Imperium?

Second is that there's naturally far more worlds where regiments are drafted then Hive Worlds. The list that follows is the usual catagories that spring to mind in the order of how many recruits they provide. You'll find mention of the imperial tithe below. It translates to taxes, reascourses and most importantly Imperial guard regiments. If I'm up for it I'll edit this with access to source material (and numbers) later:

Fortress World
Hive worlds
1*Agri World
2*Shrine World
3*Forge World
Frontier World(/Warzone)
Developing World <--Earth of today
Pleasure World
Feudal World
Feral World
Death World
4*Astartes home Worlds/Reaserch Stations/small Colonies/space farers

1*Agri Worlds wary immensly in recruitment since it's a catch all term for worlds that does not fit the bill of the others. Basicly "main export: foodstuffs" may be enough to title something as an agri World.
2*In the case of Shrine worlds they usually fall under the jurisdiction of the Ecclesiarchy and hence are forbidden to field "men at arms" with the assumed exception of PDF. They are also the most commonplace to find Adepta sororitas but as far as I know they are not an exception to the Imperial tithe.
3*Usually theese are technically under the jurisdiction of the adeptus mechanicus but seeing how they produce military supplies, tanks and sometimes are oblidged to provide Imperial guardsmen I've put them fairly high on the list. Though the Mechanicus stand outside the ordinary imperial tithe.
4* All of these are an exception to the Imperial tithe. The only documented example of an Astartes homeworld that provide Imperial Guard regiments is Ultramar, which makes sence since Ultramar is the only astartes realm to Composite multiple worlds (at it's highest point it apparently incorporated about 500 worlds. Currently it's something like 10).

Now to put it in perspective Earth of today is considered to be a developing world so our planets entire military + is drafted upwards in the list. Naturally the size of the planet, ammount of reasources, competent of rulers, social order, proximity to conflicts, schola progenium and Adeptus presences are all factors in the final ammounts of recruits drawn.

You never really know the ammount of inhabited planets in a system but the administratum works in sector scale tithes (a sector being roughly 500planets) with the sector governor being in overall responsibility of the planetary governors delivering the tithe. With this system, even with only a 1% of a sectors population being drafted to military service it can usually fend for itself or at least have enough reasources to halt of potential threats untill help can arrive.

Edit: In addition there's abhuman worlds and alien mercenaries for hire. Most commonly Hrud, Kroot and Orcs.

Could you link the page? I'd like to see a reference.

Yeah, the Imperial war machine is epic in scale. Usually it's a question of internal politics (and HERESY) that slows down it's workings though. Don't dwell to much on it though. If you do you'll soon realise how unfair it is when one of the space marine poster boys falls to a lasgun.

eh, sort off. Communications is still pretty good throughout the Imperium. That's why astropaths are so important. If half the Imperium where to be annihalated the other half would quickly be made aware.

Usually the numbers of 40k are extremly rough estimates. The whole "Empire of 1.000.000 Worlds" as quoted in fire warrior probably wouldn't hold up if you could meassure it properly. I guess it serves nicely since no one really in the Imperium has got any idea. The closest things we've come to legit information on this stuff is all fantasy flight published informations, which may or may not be canon. I love it because it gives a depth to the Imperium that GW produced stuff simply lack.