Fatto matematico: 20375 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 20375 is an unremarkable number.
Data storica: October 13th is the day in 1332 that Rinchinbal Khan, Emperor Ningzong of Yuan becomes the Khagan of the Mongols and Emperor of the Yuan Dynasty, reigning for only 53 days.