listing the divisors of 901,2,3,5,6,9,10,15,18,30,45,90We can collect pairs of divisors that multiply to 90(1,90),(2,45),(3,30),(5,18),(6,15),(9,10)We see then that the product is 906
In general the product of the factors of n will be n12# of factors of nYou can determine the # of factors of n by taking the product of each of theexponents of the prime factors plus 1. For example 90=21⋅32⋅51It has (1+1)(2+1)(1+1)=12 factors which multiply to 9012/2=906
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