the.com/20
The number where fingers run out and shoes come off.
means The natural number after 19 and before 21, equal to twice ten.
from From Old English 'twentig', literally 'two tens' — the -tig suffix meaning a group of ten.
Base countingThe Maya counted in twenties, fingers plus toes.
ScoreLincoln's 'four score' means four twenties: eighty.
Vigesimal echoFrench still says 'quatre-vingts', four-twenties, for eighty.