Q: What is the sum of all factors of the number 21,165 excluding 21,165?
A: 15,123
The factors of the number 21,165 are: 1, 3, 5, 15, 17, 51, 83, 85, 249, 255, 415, 1245, 1411, 4233, 7055, 21165.
If you add them up, you will get the total of 21,180. Now subtract 21,165 to get 15,123