With this information, what is σ(d(90))?
Let n be a positive integer. The divisor function, d(n), is defined as the number of positive divisors of n. The sigma function, σ(n), is defined as the sum of all of the positive divisors of n.
What is σ(d(90))?
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90 -- 1 2 3 5 9 | 10 19 etc
d(90) = 10
10 -- 1 2 5 10
sig(10) = 1+2+5+10 = 18