Q: What is the sum of all factors of the number 13,780 excluding 13,780?
A: 17,972
The factors of the number 13,780 are: 1, 2, 4, 5, 10, 13, 20, 26, 52, 53, 65, 106, 130, 212, 260, 265, 530, 689, 1060, 1378, 2756, 3445, 6890, 13780.
If you add them up, you will get the total of 13,797. Now subtract 13,780 to get 17,972