Factor Lister and Summer

//Hydreigon_Lord
//This program generates all the factors of a given number.

#include <iostream>
#include <vector>
#define POSITION (factors.begin() + pos)
using namespace std;

int main()
{
    unsigned long long num;
    cout << "Enter a number: ";
    cin >> num;
    vector<unsigned long long> factors;
    factors.push_back(1);
    if (num != 1)
    {
        factors.push_back(num);
        int pos = 1;
        for (unsigned long long i = 2; i * i <= num; i++)
        {
            if (i * i == num)
                factors.insert(POSITION, i);
            else
            {
                if (num % i == 0)
                {
                    factors.insert(POSITION, num / i);
                    factors.insert(POSITION, i);
                    pos++;
                }
            }
        }
    }
    cout << num << " has " << factors.size() << " factors: ";
    unsigned long long sum = 0;
    for (unsigned long long f: factors)
    {
        cout << f << " ";
        sum += f;
    }
    cout << endl;
    cout << "The sum of the factors is: " << sum << endl;
    double ratio = (double)sum / num;
    cout << "The ratio of the factor sum to the number is: " << ratio << endl;
    return 0;
}