Fatto generale: 20731 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20731 is a boring number.
Trivia: 20731 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: October 3rd is the day in 1908 that the Pravda newspaper is founded by Leon Trotsky, Adolph Joffe, Matvey Skobelev and other Russian exiles in Vienna.