I'm not sure how to explain the prcoess, but the smallest number with 18 positive divisors is \(180\)
We have \(1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180.\)
Now, \(180^2 = 32400\)
You could also use prime factorization, by doing
\(32400 =2 ^ 4 ×3 ^ 4 ×5 ^ 2\)
\((4+1)(4+1)(2+1)=5×5×3=75\)
Thus, our answeris 75.
Thanks! :)