Fair enough. As a child I could never remember if it was 50 or 60 that had "halv" (50 is halvtreds, 60 is treds, neither word have any resemblance to 5, 6 or 10, but 50 sounds a bit like it ought to be half of 60), but my point is that the number system has nothing to do with base 20 except a few etymological roots of some names, that for all intents and purposes might as well be random.

But you are right: they are worse than random, since they are named close enough to other entities to be confuseaable.