Fatto generale: 19820 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 19820 is a boring number.
Trivia: 19820 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 6th is the day in 1808 that John Jacob Astor incorporates the American Fur Company, that would eventually make him America's first millionaire.