Q: What is the sum of all factors of the number 21,645 excluding 21,645?
A: 19,851
The factors of the number 21,645 are: 1, 3, 5, 9, 13, 15, 37, 39, 45, 65, 111, 117, 185, 195, 333, 481, 555, 585, 1443, 1665, 2405, 4329, 7215, 21645.
If you add them up, you will get the total of 21,664. Now subtract 21,645 to get 19,851