In a 110, unless the pieces are pretty thin, 20 of them is a bit overboard, IMO, lol. But gotta ask first, what will you be keeping in there?
If you're going to be keeping things like discus and angels, then I wouldn't think twice about putting in 20 pieces of driftwood. But if it's going to be a larger and more robust fish like a guapote, datnoid, or the equivalent of those fish then (again, depending on how wide the pieces are and how you plan to stack them), I wouldn't advise it.