Fatto generale: 20123 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20123 is an uninteresting number.
Trivia: 20123 is an unremarkable number.
Data storica: February 3rd is the day in 1998 that Karla Faye Tucker is executed in Texas becoming the first woman executed in the United States since 1984.