SOLUTION: find the number and sum of all the divisor of 840

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Question 71406: find the number and sum of all the divisor of 840
Answer by venugopalramana(3286) About Me  (Show Source):
You can put this solution on YOUR website!
find the number and sum of all the divisor of 840
1*840
2*420
3*280
4*210
5*168
6*140
7*120
8*105
10*84
12*70
14*60
15*56
20*42
21*40
24*35
28*30
30*28....REPEATING.
HENCE ALL THE FACTORS ARE
1,2,3,4,5,6,8,10,12,14,15,20,21,24,28,30,
35,40,42,56,60,70,84,105,120,140,168,210,
280,420,840.
YOU CAN SUM THEM UP OR USE A FORMULA FOR THE PURPOSE.