Q: What is the sum of all factors of the number 1,820 excluding 1,820?
A: 2,884
The factors of the number 1,820 are: 1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820.
If you add them up, you will get the total of 1,822. Now subtract 1,820 to get 2,884