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# Find four factors of N with maximum product and sum equal to N - Set-2 in Python Program

Suppose we have a number N, we have to find all factors of N and return the product of four factors of N such that: The sum of the four factors is same as N. The product of the four factors is maximum. All four factors can be equal to each other to maximize the product.

So, if the input is like N = 60, then the output will be All the factors are -> 1 2 3 4 5 6 10 12 15 20 30 60 and product is 50625, as we 15 has been selected four times to make product largest.

To solve this, we will follow these steps −

factors := a new list

for i in range 1 to integer of (square root of n) + 1, do

if n mod i is same as 0, then

insert i at the end of factors

insert integer of (n / i) at the end of factors

sort the list factors

display factors

final_prod := 1, flag := 1

for i in range 0 to size of factors, do

for j in range i to size of factors, do

for k in range j to size of factors, do

y := n - factors[i] - factors[j] - factors[k]

if y <= 0, then

come out from the loop

if n mod y is same as 0, then

flag := 0

final_prod := maximum of factors[i] * factors[j] * factors[k] * y, final_prod

if flag is same as 0, then

display final_prod

otherwise,

display "Not possible"

## Example

Let us see the following implementation to get better understanding −

from math import * def get_factors(n) : factors = [] for i in range(1, int(sqrt(n)) + 1) : if n % i == 0 : factors.append(i) factors.append(n // i) factors.sort() print("Factors are ", factors) final_prod = 1 flag = 1 for i in range(0, len(factors)) : for j in range(i, len(factors)) : for k in range(j, len(factors)) : y = n - factors[i] - factors[j] - factors[k] if y <= 0 : break if n % y == 0 : flag = 0 final_prod = max(factors[i] * factors[j] * factors[k] * y , final_prod) if flag == 0 : print("Product is", final_prod) else : print("Not possible") n = 60 get_factors(n)

## Input

60

## Output

Factors are [1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60] Product is 50625

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