There are about 20k, up from 10k when I started there 6 years ago. But I think 5k-8k of them work at the retail stores around the world.

Then take into account all the people who do QA, all the management, marketing, business, finance, and other teams.

And you're actually left with a pretty lean engineering force. Apple engineers more stuff in house than a typical company like Dell, so that plays into the head count as well