Minimum Perimeter of Rectangle

import java.util.stream.Stream;

public class MinimumRectanglePerimeter {

     public static void main(String[] args) {

          System.out.println(perimeter(30));

     }

     public static int perimeter(int area) {

          return Stream.iterate((int) Math.sqrt(area), n -> n - 1).filter(n -> area % n == 0).map(n -> 2 * (n + area / n)).findFirst().get();

     }

}

Output:

22