
    Given a loan applicant's monthly income, calculate the total sum of all possible installment amounts that would evenly divide into their income to assess their payment flexibility. The installment amounts must be whole numbers and include all values that divide the monthly income without leaving a remainder.
    

    
def sum_div(number):
    """
    Given a loan applicant's monthly income, calculate the total sum of all possible installment amounts that would evenly divide into their income to assess their payment flexibility. The installment amounts must be whole numbers and include all values that divide the monthly income without leaving a remainder.
    

    """
def sum_div(number):
    """
    Given a loan applicant's monthly income, calculate the total sum of all possible installment amounts that would evenly divide into their income to assess their payment flexibility. The installment amounts must be whole numbers and include all values that divide the monthly income without leaving a remainder.
    

    """
    divisors = [1]
    for i in range(2, number):
        if number % i == 0:
            divisors.append(i)
    return sum(divisors)