Fatto generale: 20209 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20209 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 20209 is an unremarkable number.
Data storica: April 30th is the day in 2004 that U.S. media release graphic photos of American soldiers abusing and sexually humiliating Iraqi prisoners at Abu Ghraib prison.