Java Program 12: Java Program To Find Divisors Of Given Number


Write a JAVA program to find the divisors of a given number.


  • Divisor is a number that divides  another number without a reminder or a number that divides an integer evenly.

Ex: 10/2= 5 (Here 2 is divisor.)

Logic 1:

  • Positive Divisor of a number N will be greater than or equal to 1 and less than or equal to number N.
  • For Ex: Say Number is 4. Divisor of 4 will be 1,2 and 4.
  • To get the divisor of a number N, we should divide N by all numbers in between 1 and N including 1 and N.
  • We will use modulus operator which gives reminder. If reminder is zero, we can say given number is divisible by another number.
  • For ex: 10%2= 0 (10 is divisible by 2 without a reminder)
  • 11%2=1 (11 is divisible by 2 with a reminder as 1)

Java Code:


Logic 2:

  • A given number N can be divisible by another number  Y without any reminder if Y is greater than or equal to 1 and less than or equal to N/2.
  • In first logic, our loop will continue till counter equals to number which will make logic time consuming.
  • We can reduce the loop iteration by half just by putting logic 2.

Java Code:


Logic 3:

  •  For every divisor Y of N, there is also a corresponding divisor N/Y. Thus to find all pairs of divisors, you need only to loop from 1 to the square root N.
  • This will be more optimal solution and interviewer will expect to write this logic.

Java code:


If you have any other logic of solving above problem, please comment. It is always better to know more logic.

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Author: Amod Mahajan

My name is Amod Mahajan and I am an IT employee with 4+ years of experience in Software testing and staying in Bengaluru. My area of interest is Automation testing. I started from basics and went throw so many selenium tutorials. Thanks to Mukesh Otwani as his tutorials are easy and cover basics to advance. I have habit of exploring concepts by deep diving. I used to make notes. I thought of sharing my knowledge through posts and now I am here. #KeepLearning #ShareLearning