Q: What is the sum of all factors of the number 20,865 excluding 20,865?
A: 15,423
The factors of the number 20,865 are: 1, 3, 5, 13, 15, 39, 65, 107, 195, 321, 535, 1391, 1605, 4173, 6955, 20865.
If you add them up, you will get the total of 20,880. Now subtract 20,865 to get 15,423