LeetCode 1390 | Four Divisors | Simple Math Trick Explained

Solve LeetCode Problem 1390 – Four Divisors step by step. We find numbers with exactly 4 divisors and return the sum of their divisors using a clean math-based approach. ⏱️ Time: O(n√n) 📦 Space: O(1) Perfect for DSA beginners & interview prep.