class Calculator(AdvancedArithmetic):
    def divisorSum(self, n):
        divisors = set()            # Divisors are unique so using set
        for i in range(1,int(n**(1/2))+1):    # Going upto sqrt of n
            if n % i == 0:
                divisors.add(i)        # Adding divisor to divisors set
                divisors.add(n/i)    # Adding Quotient to divisors set
        return int(sum(divisors))