Q: What is the sum of all factors of the number 2,145 excluding 2,145?
A: 1,887
The factors of the number 2,145 are: 1, 3, 5, 11, 13, 15, 33, 39, 55, 65, 143, 165, 195, 429, 715, 2145.
If you add them up, you will get the total of 2,146. Now subtract 2,145 to get 1,887