Question: is 20 pull ups a lot?
Answer: If you do pullups like I just described, 20 in a row is a great standard to aim for. The vast majority of guys can't do that. If you get to 20 reps, it tends to be a game changer for your upper body strength. Whether your palms face in or out during each rep is more or less irrelevant in the grand scheme of 20 pullups.