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For a number $x=p_1^{e_1}p_2^{e_2}p_3^{e_3}...p_n^{e_n}$, the sum of the divisors of divisors is: \[\left(\sum_{k_1=0}^{e_1}{k_1+1}\right)\left(\sum_{k_2=0}^{e_2}{k_2+1}\right)\left(\sum_{k_3=0}^{e_3}{k_3+1}\right)...\left(\sum_{k_n=0}^{e_n}{k_n+1}\right)\]
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Thu, 17 Apr 2014 03:34 GMT