basically u just need to make a fucntion to check if a n is divisible by a number from 1 to 1000 or not, and summ all the numbers that are divisors of n.

class Calculator(AdvancedArithmetic):
    def divisorSum(self, n):
            p=0
            e=0
            for i in range(1,1001):
                e=(n%i)
                if e==0:
                    p+=i
            return p
            pass