2021 AIME I Problem 14

For any positive integer a, \sigma(a) denotes the sum of the positive integer divisors of a. Let n be the least positive integer such that \sigma(a^n)-1 is divisible by 2021 for all positive integers a. Find the sum of the prime factors in the prime factorization of n.

Leading zeroes must be inputted, so if your answer is 34, then input 034

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.