I worked on one and our team had about 23 people. Out of that, there were about 6 or 7 actors, so the rest were crew and we needed every single one of them!
We had:
1 Director (who co-produced with the lead actor)
2 Writers (though we all contributed)
4 Associate Producers (I was one; we all had different duties)
1 DP w/ his own equipt.
1 Sound guy
2 PA's (1 also served as Asst Camera, the other held the boom, when they weren't doing the usual PA stuff. We had a third scheduled, but he never showed up.)
1 Editor
1 Asst. Editor
1 Set Designer
Actors did their own makeup and wardrobe, and we all shlepped equipment. At one point, I recall I was carrying the script & clapper in one hand, bag of lighting equipment and cables in the other, about 4 umbrellas under my arm (I was also umbrella wrangler when a sudden summer shower happened during our outdoor shoot), and a guitar on my back.