Q: What is the sum of all factors of the number 28,405 excluding 28,405?
A: 11,915
The factors of the number 28,405 are: 1, 5, 13, 19, 23, 65, 95, 115, 247, 299, 437, 1235, 1495, 2185, 5681, 28405.
If you add them up, you will get the total of 28,416. Now subtract 28,405 to get 11,915