Q: What is the sum of all factors of the number 1,690 excluding 1,690?
A: 1,604
The factors of the number 1,690 are: 1, 2, 5, 10, 13, 26, 65, 130, 169, 338, 845, 1690.
If you add them up, you will get the total of 1,691. Now subtract 1,690 to get 1,604