Q: What is the sum of all factors of the number 20,961 excluding 20,961?
A: 11,331
The factors of the number 20,961 are: 1, 3, 9, 17, 51, 137, 153, 411, 1233, 2329, 6987, 20961.
If you add them up, you will get the total of 20,972. Now subtract 20,961 to get 11,331