Fatto generale: 20407 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20407 is an uninteresting number.
Trivia: 20407 is an unremarkable number.
Data storica: November 14th is the day in 1957 that the Apalachin Meeting outside Binghamton, New York is raided by law enforcement, and many high level Mafia figures are arrested.