
    Given the total number of potential attendees for a social event, calculate the sum of all possible group sizes that could evenly divide the attendees, helping organizers understand different ways to structure breakout sessions and activities. This calculation will help determine the flexibility in event planning and ensure optimal social interaction opportunities for all participants.
    

    
def sum_div(number):
    """
    Given the total number of potential attendees for a social event, calculate the sum of all possible group sizes that could evenly divide the attendees, helping organizers understand different ways to structure breakout sessions and activities. This calculation will help determine the flexibility in event planning and ensure optimal social interaction opportunities for all participants.
    

    """
def sum_div(number):
    """
    Given the total number of potential attendees for a social event, calculate the sum of all possible group sizes that could evenly divide the attendees, helping organizers understand different ways to structure breakout sessions and activities. This calculation will help determine the flexibility in event planning and ensure optimal social interaction opportunities for all participants.
    

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