Q: What is the sum of all factors of the number 1,660 excluding 1,660?
A: 1,868
The factors of the number 1,660 are: 1, 2, 4, 5, 10, 20, 83, 166, 332, 415, 830, 1660.
If you add them up, you will get the total of 1,661. Now subtract 1,660 to get 1,868