é número perfeito
public static bool IsPerfectNumber(int number)
{
if (number < 0)
{
throw new ArgumentException($"{nameof(number)} cannot be negative");
}
var sum = 0; /* sum of its positive divisors */
for (var i = 1; i < number; ++i)
{
if (number % i == 0)
{
sum += i;
}
}
return sum == number;
}
PrashantUnity