c#

public static int divisors(int n)

{
    int divisors = 0;
    if (n % 2 != 0)
    {
        return divisors;
    }
    else for (int i = 1; i <= Math.Floor(Math.Sqrt(n/2)); i++)
    {
        if ((n/2) % i == 0)
        {
            divisors++;
            if (i*i != n/2)
            {
                divisors++;
            }
        }
    }
    return divisors;
}