Class 11 CS Practical - 24

24 - Write a program in Python to input a number and determine whether the number is a perfect number or not.

Perfect Number

A perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself.

n=int(input("Enter the number: ")) 

sum=0 

for i in range(1,n): 

    if (n%i==0): 

        sum = sum+i 

if(sum==n): 

    print(n,"is a perfect number") 

else: 

    print(n,"is not a perfect number")

Output:

Enter the number: 6

6  is a perfect number

Enter the number: 25

25  is not a perfect number