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The sum of the positive divisors of a positive integer of the form 2^i*3^j is equal to 1815. What is i+j?

 
 Nov 22, 2020
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2^i*3^j ==2^3 * 3^4 =648

 

648 =(1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 27, 36, 54, 72, 81, 108, 162, 216, 324, 648) >>Total = 1815 

 
 Nov 22, 2020

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