Q: What is the sum of all factors of the number 21,009 excluding 21,009?
A: 7,791
The factors of the number 21,009 are: 1, 3, 47, 141, 149, 447, 7003, 21009.
If you add them up, you will get the total of 21,016. Now subtract 21,009 to get 7,791