Hecho general: 20439 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 20439 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 20439 is a boring number.
Fecha histórica: December 16th is the day in 1950 that U.S. President Harry S. Truman declares a state of emergency, after Chinese troops enter the fight with communist North Korea in the Korean War.