Fatto generale: 20518 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20518 is an unremarkable number.
Trivia: 20518 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 4th is the day in 1865 that the third and final national flag of the Confederate States of America is adopted by the Confederate Congress.