Hecho general: 20740 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 20740 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 20740 is a boring number.
Fecha histórica: October 12th is the day in 1933 that the United States Army Disciplinary Barracks on Alcatraz Island, is acquired by the United States Department of Justice.