GCD of 28, 39, 47, 20 Calculator

Given Input numbers are 28, 39, 47, 20

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

Divisors of 28

List of positive integer divisors of 28 that divides 28 without a remainder.

1, 2, 4, 7, 14, 28

Divisors of 39

List of positive integer divisors of 39 that divides 39 without a remainder.

1, 3, 13, 39

Divisors of 47

List of positive integer divisors of 47 that divides 47 without a remainder.

1, 47

Divisors of 20

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

1, 2, 4, 5, 10, 20

Greatest Common Divisior

We found the divisors of 28, 39, 47, 20 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 28, 39, 47, 20 is 1.

Therefore, GCD of numbers 28, 39, 47, 20 is 1

Given Input Data is 28, 39, 47, 20

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

Prime Factorization of 28 is 2 x 2 x 7

Prime Factorization of 39 is 3 x 13

Prime Factorization of 47 is 47

Prime Factorization of 20 is 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(28, 39) = 1092

GCD(28, 39) = ( 28 x 39 ) / 1092

GCD(28, 39) = 1092 / 1092

GCD(28, 39) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 47

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

LCM(1, 47) = 47

GCD(1, 47) = ( 1 x 47 ) / 47

GCD(1, 47) = 47 / 47

GCD(1, 47) = 1

Step3:

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

GCD of 28, 39, 47, 20 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 83, 81, 44, 57
• GCD of 30, 25, 65, 83
• GCD of 68, 49, 30, 70
• GCD of 98, 59, 24, 41
• GCD of 29, 59, 29, 75

1. What is the GCD of 28, 39, 47, 20?

GCD of 28, 39, 47, 20 is 1

2. Where do I get the detailed procedure to find GCD of 28, 39, 47, 20?

You can find a detailed procedure to find GCD of 28, 39, 47, 20 on our page.

3. How to find GCD of 28, 39, 47, 20 on a calculator?

You can find the GCD of 28, 39, 47, 20 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.