GCD of 651, 505, 20, 428 Calculator

Given Input numbers are 651, 505, 20, 428

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

Divisors of 651

List of positive integer divisors of 651 that divides 651 without a remainder.

1, 3, 7, 21, 31, 93, 217, 651

Divisors of 505

List of positive integer divisors of 505 that divides 505 without a remainder.

1, 5, 101, 505

Divisors of 20

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

1, 2, 4, 5, 10, 20

Divisors of 428

List of positive integer divisors of 428 that divides 428 without a remainder.

1, 2, 4, 107, 214, 428

Greatest Common Divisior

We found the divisors of 651, 505, 20, 428 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 651, 505, 20, 428 is 1.

Therefore, GCD of numbers 651, 505, 20, 428 is 1

Given Input Data is 651, 505, 20, 428

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

Prime Factorization of 651 is 3 x 7 x 31

Prime Factorization of 505 is 5 x 101

Prime Factorization of 20 is 2 x 2 x 5

Prime Factorization of 428 is 2 x 2 x 107

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(651, 505) = 328755

GCD(651, 505) = ( 651 x 505 ) / 328755

GCD(651, 505) = 328755 / 328755

GCD(651, 505) = 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 428

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

LCM(1, 428) = 428

GCD(1, 428) = ( 1 x 428 ) / 428

GCD(1, 428) = 428 / 428

GCD(1, 428) = 1

GCD of 651, 505, 20, 428 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 853, 233, 98, 962
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• GCD of 894, 984, 74, 807

1. What is the GCD of 651, 505, 20, 428?

GCD of 651, 505, 20, 428 is 1

2. Where do I get the detailed procedure to find GCD of 651, 505, 20, 428?

You can find a detailed procedure to find GCD of 651, 505, 20, 428 on our page.

3. How to find GCD of 651, 505, 20, 428 on a calculator?

You can find the GCD of 651, 505, 20, 428 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.