Fatto generale: 20173 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20173 is a boring number.
Trivia: 20173 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 25th is the day in 1807 that the Swansea and Mumbles Railway, then known as the Oystermouth Railway, becomes the first passenger carrying railway in the world.