Q: What is the sum of all factors of the number 21,255 excluding 21,255?
A: 15,705
The factors of the number 21,255 are: 1, 3, 5, 13, 15, 39, 65, 109, 195, 327, 545, 1417, 1635, 4251, 7085, 21255.
If you add them up, you will get the total of 21,270. Now subtract 21,255 to get 15,705