Q: What is the sum of all factors of the number 1,040 excluding 1,040?
A: 1,564
The factors of the number 1,040 are: 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040.
If you add them up, you will get the total of 1,041. Now subtract 1,040 to get 1,564