Fatto generale: 20557 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20557 is an unremarkable number.
Trivia: 20557 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 12th is the day in 1945 that U.S. President Franklin D. Roosevelt dies while in office; vice-president Harry Truman is sworn in as the 33rd President.