Hecho matemático: 20218 is an unremarkable number.
Trivia: 20218 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: May 9th is the day in 1964 that Ngo Dinh Can, de facto ruler of central Vietnam under his brother President Ngo Dinh Diem before the family's toppling, is executed.