20 can been used as a number base. Remnants of this system remain in some European languages, for example in the English “score” (20) and the French “quatre-vingts” (80, literally four groups of twenty). The old (pre-decimal) English monetary system had twenty shillings in a pound. The ancient Mayan numerical system – counting on fingers and toes – was a base 20 or "vigesimal" system.
t w ɛ n t i WORD_BOUNDARY k æ n WORD_BOUNDARY b ɪ n WORD_BOUNDARY j uː z d WORD_BOUNDARY æ z WORD_BOUNDARY ʌ WORD_BOUNDARY n ʌ m b ə ɹ WORD_BOUNDARY b eɪ s WORD_BOUNDARY ɹ ɛ m n ə n t s WORD_BOUNDARY ʌ v WORD_BOUNDARY ð ɪ s WORD_BOUNDARY s ɪ s t ə m WORD_BOUNDARY ɹ ɪ m eɪ n WORD_BOUNDARY ɪ n WORD_BOUNDARY s ʌ m WORD_BOUNDARY j ʊ ɹ ɹ ə p iə n WORD_BOUNDARY l æ ŋ ɡ w ɪ d̠ʒ ɪ z WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY ɛ ɡ z æ m p ə l WORD_BOUNDARY ɪ n ð ɪ WORD_BOUNDARY ɪ ŋ ɡ l ɪ ʃ WORD_BOUNDARY s k ɔ ɹ WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY æ n d WORD_BOUNDARY ð ə WORD_BOUNDARY f ɹ ɛ n t̠ʃ WORD_BOUNDARY k w æ t ə ɹ v ɪ ŋ t s WORD_BOUNDARY eɪ t i WORD_BOUNDARY l ɪ t ə ɹ ɹ ə l i WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY ɡ ɹ uː p s WORD_BOUNDARY ʌ v WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY ð ɪ WORD_BOUNDARY oʊ l d WORD_BOUNDARY p ɹ iː d ɛ s ɪ m ə l WORD_BOUNDARY ɪ ŋ ɡ l ɪ ʃ WORD_BOUNDARY m ɑ n ɪ t ɛ ɹ i WORD_BOUNDARY s ɪ s t ə m WORD_BOUNDARY h æ d WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY ʃ ɪ l ɪ ŋ z WORD_BOUNDARY ɪ n WORD_BOUNDARY ʌ WORD_BOUNDARY p aʊ n d WORD_BOUNDARY ð ɪ WORD_BOUNDARY eɪ n t̠ʃ ə n t WORD_BOUNDARY m aɪ ə n WORD_BOUNDARY n uː m ɛ ɹ ɪ k ə l WORD_BOUNDARY s ɪ s t ə m WORD_BOUNDARY k aʊ n t ɪ ŋ WORD_BOUNDARY ɔ n WORD_BOUNDARY f ɪ ŋ ɡ ə ɹ z WORD_BOUNDARY æ n d WORD_BOUNDARY t oʊ z WORD_BOUNDARY w ʌ z ʌ WORD_BOUNDARY b eɪ s WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY v aɪ d̠ʒ s ɪ m ə l WORD_BOUNDARY s ɪ s t ə m WORD_BOUNDARY