GCD of 817, 420, 840, 571 Calculator

Given Input numbers are 817, 420, 840, 571

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

Divisors of 817

List of positive integer divisors of 817 that divides 817 without a remainder.

1, 19, 43, 817

Divisors of 420

List of positive integer divisors of 420 that divides 420 without a remainder.

1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420

Divisors of 840

List of positive integer divisors of 840 that divides 840 without a remainder.

1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840

Divisors of 571

List of positive integer divisors of 571 that divides 571 without a remainder.

1, 571

Greatest Common Divisior

We found the divisors of 817, 420, 840, 571 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 817, 420, 840, 571 is 1.

Therefore, GCD of numbers 817, 420, 840, 571 is 1

Given Input Data is 817, 420, 840, 571

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

Prime Factorization of 817 is 19 x 43

Prime Factorization of 420 is 2 x 2 x 3 x 5 x 7

Prime Factorization of 840 is 2 x 2 x 2 x 3 x 5 x 7

Prime Factorization of 571 is 571

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(817, 420) = 343140

GCD(817, 420) = ( 817 x 420 ) / 343140

GCD(817, 420) = 343140 / 343140

GCD(817, 420) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 840

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

LCM(1, 840) = 840

GCD(1, 840) = ( 1 x 840 ) / 840

GCD(1, 840) = 840 / 840

GCD(1, 840) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 571

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

LCM(1, 571) = 571

GCD(1, 571) = ( 1 x 571 ) / 571

GCD(1, 571) = 571 / 571

GCD(1, 571) = 1

GCD of 817, 420, 840, 571 is 1

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1. What is the GCD of 817, 420, 840, 571?

GCD of 817, 420, 840, 571 is 1

2. Where do I get the detailed procedure to find GCD of 817, 420, 840, 571?

You can find a detailed procedure to find GCD of 817, 420, 840, 571 on our page.

3. How to find GCD of 817, 420, 840, 571 on a calculator?

You can find the GCD of 817, 420, 840, 571 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.