2 ms·D(n) is equal to f'(0) where f(x) = Π_(p∈P(n)) x + p and P(n) is the set of prime factors of n.by GrantMoyer 2y agoD(n) is equal to f'(0) where f(x) = Π_(p∈P(n)) x + p and P(n) is the set of prime factors of n.