PHP

php Sum of all the factors of a number

<?php
// Find sum of all divisors
// of a natural number
 
// Function to calculate sum of all
//divisors of a given number
function divSum($n)
{
    if($n == 1)
      return 1;
 
    // Sum of divisors
    $result = 0;
 
    // find all divisors
    // which divides 'num'
    for ( $i = 2; $i <= sqrt($n); $i++)
    {
        // if 'i' is divisor of 'n'
        if ($n % $i == 0)
        {
            // if both divisors are same
            // then add it once else add
            // both
            if ($i == ($n / $i))
                $result += $i;
            else
                $result += ($i + $n / $i);
        }
    }
 
    // Add 1 and n to result as
    // above loop considers proper
    // divisors greater than 1.
    return ($result + $n + 1);
}
 
// Driver Code
$n = 30;
echo divSum($n);
 
// This code is contributed by SanjuTomar.
?>