Fatto generale: 20981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 20981 is a boring number.
Data storica: June 10th is the day in 1935 that Dr. Robert Smith takes his last drink, and Alcoholics Anonymous is founded in Akron, Ohio, United States, by him and Bill Wilson.