see the sum of divisors of a number of x=p1ap2bp3c....pmr is p1a+1-1 *p2b+1-1 *..... --------------------- p1-1 p2 -1
use dis formula here sum of divisors ending with zero, so choose 10 first now u have 2^2 *3^3*5 so sum of divisors = 10* [(2^3-1)/2-1]*{3^4-1/3-1}*(5^2-1)/5-1 =16800
Moderation Team
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