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In this article, we will learn about the solution to the problem statement given below.

**Problem statement **− We are given a number, we need to display the sum of all even factors of the number.

We check whether the number is odd, then there are no even factors, so return 0.

If the number is even, we go through the computation. All other terms except 20 multiply to produce an even factor sum.

To remove all odd numbers in even factor, we ignore the 20 which is 1. After this step, we only got even factors. Note that 2 is the only even prime available to us.

Now let’s see the implementation below−

# math module import math # Returns sum of all # factors of n. def sumofevenFactors(n) : # If n is odd if (n % 2 != 0) : return 0 # Traversal res = 1 for i in range(2, (int)(math.sqrt(n)) + 1) : # if i divides n count = 0 curr_sum = 1 curr_term = 1 while (n % i == 0) : count= count + 1 n = n // i # here we remove the # 2^0 that is 1. All # other factors if (i == 2 and count == 1) : curr_sum = 0 curr_term = curr_term * i curr_sum = curr_sum + curr_term res = res * curr_sum # when n is a prime number if (n >= 2) : res = res * (1 + n) return res # main n = 22 print(sumofevenFactors(n))

24

All the variables and functions are declared in the global scope as shown in the figure above.

In this article, we have learned how we can find the sum of even factors of a number.

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