Q: What is the sum of all factors of the number 20,691 excluding 20,691?
A: 13,889
The factors of the number 20,691 are: 1, 3, 9, 11, 19, 33, 57, 99, 121, 171, 209, 363, 627, 1089, 1881, 2299, 6897, 20691.
If you add them up, you will get the total of 20,704. Now subtract 20,691 to get 13,889