Problem #260
Totient sum
Let L = \sum_{n=1}^{\infty} \frac{\varphi(n)}{2020^n - 1} Here \varphi(n) is the totient function. It can be shown that L can be represented as \frac{P}{Q}, where P and Q are coprime integers, and Q \not\equiv 0\pmod{1000000007}. Find the value of P\cdot Q^{-1} modulo 1000000007.