General fact: 20030 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 20030 is an unremarkable number.
Trivia: 20030 is an uninteresting number.
Historical date: November 2nd is the day in 1570 that a tsunami in the North Sea devastates the coast from Holland to Jutland, killing more than 1,000 people.