GCD of 20, 426, 666, 647 Calculator

Given Input numbers are 20, 426, 666, 647

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

Divisors of 20

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

1, 2, 4, 5, 10, 20

Divisors of 426

List of positive integer divisors of 426 that divides 426 without a remainder.

1, 2, 3, 6, 71, 142, 213, 426

Divisors of 666

List of positive integer divisors of 666 that divides 666 without a remainder.

1, 2, 3, 6, 9, 18, 37, 74, 111, 222, 333, 666

Divisors of 647

List of positive integer divisors of 647 that divides 647 without a remainder.

1, 647

Greatest Common Divisior

We found the divisors of 20, 426, 666, 647 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 20, 426, 666, 647 is 1.

Therefore, GCD of numbers 20, 426, 666, 647 is 1

Given Input Data is 20, 426, 666, 647

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

Prime Factorization of 20 is 2 x 2 x 5

Prime Factorization of 426 is 2 x 3 x 71

Prime Factorization of 666 is 2 x 3 x 3 x 37

Prime Factorization of 647 is 647

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(20, 426) = 4260

GCD(20, 426) = ( 20 x 426 ) / 4260

GCD(20, 426) = 8520 / 4260

GCD(20, 426) = 2

Step2:

Here we consider the GCD from the above i.e. 2 as first number and the next as 666

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

LCM(2, 666) = 666

GCD(2, 666) = ( 2 x 666 ) / 666

GCD(2, 666) = 1332 / 666

GCD(2, 666) = 2

Step3:

Here we consider the GCD from the above i.e. 2 as first number and the next as 647

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

LCM(2, 647) = 1294

GCD(2, 647) = ( 2 x 647 ) / 1294

GCD(2, 647) = 1294 / 1294

GCD(2, 647) = 1

GCD of 20, 426, 666, 647 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 34, 596, 249, 437
• GCD of 14, 124, 178, 971
• GCD of 80, 908, 764, 195
• GCD of 63, 678, 407, 295
• GCD of 21, 815, 633, 427

1. What is the GCD of 20, 426, 666, 647?

GCD of 20, 426, 666, 647 is 1

2. Where do I get the detailed procedure to find GCD of 20, 426, 666, 647?

You can find a detailed procedure to find GCD of 20, 426, 666, 647 on our page.

3. How to find GCD of 20, 426, 666, 647 on a calculator?

You can find the GCD of 20, 426, 666, 647 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.