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Check Perfect Number in Python

Check whether a number is a perfect number (sum of proper divisors equals the number).

BeginnerConditional ProgramsExample 10 of 20
check-perfect-number.py
1# Program to check perfect number
2

3num = int(input("Enter a positive integer: "))
4

5if num <= 0:
6    print("Number must be positive.")
7else:
8    total = 0
9    for i in range(1, num):
10        if num % i == 0:
11            total += i
12

13    if total == num:
14        print(num, "is a perfect number")
15    else:
16        print(num, "is not a perfect number")

Output

Enter a positive integer: 6
6 is a perfect number

What's going on

A perfect number equals the sum of its positive divisors excluding itself.

We loop from 1 to num-1 and sum divisors to compare with num.

After this program

If the idea is still fuzzy, read Day 8: Conditional Statements in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 20 conditional programs, or see every topic on Python exercises.

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