Q: What is the sum of all factors of the number 3,420 excluding 3,420?
A: 7,500
The factors of the number 3,420 are: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 19, 20, 30, 36, 38, 45, 57, 60, 76, 90, 95, 114, 171, 180, 190, 228, 285, 342, 380, 570, 684, 855, 1140, 1710, 3420.
If you add them up, you will get the total of 3,427. Now subtract 3,420 to get 7,500