Q: What is the sum of all factors of the number 1,098 excluding 1,098?
A: 1,320
The factors of the number 1,098 are: 1, 2, 3, 6, 9, 18, 61, 122, 183, 366, 549, 1098.
If you add them up, you will get the total of 1,099. Now subtract 1,098 to get 1,320