Fatto generale: 20741 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20741 is an unremarkable number.
Trivia: 20741 is an unremarkable number.
Data storica: October 13th is the day in 1881 that Revival of the Hebrew language as Eliezer Ben-Yehuda and friends agree to use Hebrew exclusively in their conversations.