
    Given a user's total number of direct friends on a social network, calculate the sum of all possible friend group sizes that can evenly organize their entire friend network, where each group must contain an equal number of friends. This value will be used to evaluate network distribution patterns and identify users with compatible social structures for friend recommendations.
    

    
def sum_div(number):
    """
    Given a user's total number of direct friends on a social network, calculate the sum of all possible friend group sizes that can evenly organize their entire friend network, where each group must contain an equal number of friends. This value will be used to evaluate network distribution patterns and identify users with compatible social structures for friend recommendations.
    

    """
def sum_div(number):
    """
    Given a user's total number of direct friends on a social network, calculate the sum of all possible friend group sizes that can evenly organize their entire friend network, where each group must contain an equal number of friends. This value will be used to evaluate network distribution patterns and identify users with compatible social structures for friend recommendations.
    

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