Fatto matematico: 20189 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 20189 is an uninteresting number.
Data storica: April 10th is the day in 1992 that the Maraghar Massacre, killing of ethnic Armenian civil population of the village Maraghar by Azerbaijani troops during the Nagorno-Karabakh War.