GCD of 403, 202, 20, 640 Calculator

Given Input numbers are 403, 202, 20, 640

To find the GCD of numbers using factoring list out all the divisors of each number

Divisors of 403

List of positive integer divisors of 403 that divides 403 without a remainder.

1, 13, 31, 403

Divisors of 202

List of positive integer divisors of 202 that divides 202 without a remainder.

1, 2, 101, 202

Divisors of 20

List of positive integer divisors of 20 that divides 20 without a remainder.

1, 2, 4, 5, 10, 20

Divisors of 640

List of positive integer divisors of 640 that divides 640 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640

Greatest Common Divisior

We found the divisors of 403, 202, 20, 640 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 403, 202, 20, 640 is 1.

Therefore, GCD of numbers 403, 202, 20, 640 is 1

Given Input Data is 403, 202, 20, 640

Make a list of Prime Factors of all the given numbers initially

Prime Factorization of 403 is 13 x 31

Prime Factorization of 202 is 2 x 101

Prime Factorization of 20 is 2 x 2 x 5

Prime Factorization of 640 is 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5

The above numbers do not have any common prime factor. So GCD is 1

Step1:

Let's calculate the GCD of first two numbers

The formula of GCD is GCD(a, b) = ( a x b) / LCM(a, b)

LCM(403, 202) = 81406

GCD(403, 202) = ( 403 x 202 ) / 81406

GCD(403, 202) = 81406 / 81406

GCD(403, 202) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 20

The formula of GCD is GCD(a, b) = ( a x b) / LCM(a, b)

LCM(1, 20) = 20

GCD(1, 20) = ( 1 x 20 ) / 20

GCD(1, 20) = 20 / 20

GCD(1, 20) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 640

The formula of GCD is GCD(a, b) = ( a x b) / LCM(a, b)

LCM(1, 640) = 640

GCD(1, 640) = ( 1 x 640 ) / 640

GCD(1, 640) = 640 / 640

GCD(1, 640) = 1

GCD of 403, 202, 20, 640 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 930, 787, 68, 253
• GCD of 981, 555, 72, 728
• GCD of 386, 683, 65, 901
• GCD of 616, 553, 97, 579
• GCD of 182, 250, 66, 574

1. What is the GCD of 403, 202, 20, 640?

GCD of 403, 202, 20, 640 is 1

2. Where do I get the detailed procedure to find GCD of 403, 202, 20, 640?

You can find a detailed procedure to find GCD of 403, 202, 20, 640 on our page.

3. How to find GCD of 403, 202, 20, 640 on a calculator?

You can find the GCD of 403, 202, 20, 640 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.