Fatto generale: 20131 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20131 is an uninteresting number.
Trivia: 20131 is an unremarkable number.
Data storica: February 11th is the day in 1855 that Kassa Hailu is crowned Tewodros II, Emperor of Ethiopia, by Abuna Salama III in a ceremony at the church of Derasge Maryam.