Q: What is the sum of all factors of the number 21,890 excluding 21,890?
A: 21,310
The factors of the number 21,890 are: 1, 2, 5, 10, 11, 22, 55, 110, 199, 398, 995, 1990, 2189, 4378, 10945, 21890.
If you add them up, you will get the total of 21,911. Now subtract 21,890 to get 21,310