GCD of 21, 609, 866, 247 Calculator

Given Input numbers are 21, 609, 866, 247

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

Divisors of 21

List of positive integer divisors of 21 that divides 21 without a remainder.

1, 3, 7, 21

Divisors of 609

List of positive integer divisors of 609 that divides 609 without a remainder.

1, 3, 7, 21, 29, 87, 203, 609

Divisors of 866

List of positive integer divisors of 866 that divides 866 without a remainder.

1, 2, 433, 866

Divisors of 247

List of positive integer divisors of 247 that divides 247 without a remainder.

1, 13, 19, 247

Greatest Common Divisior

We found the divisors of 21, 609, 866, 247 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 21, 609, 866, 247 is 1.

Therefore, GCD of numbers 21, 609, 866, 247 is 1

Given Input Data is 21, 609, 866, 247

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

Prime Factorization of 21 is 3 x 7

Prime Factorization of 609 is 3 x 7 x 29

Prime Factorization of 866 is 2 x 433

Prime Factorization of 247 is 13 x 19

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(21, 609) = 609

GCD(21, 609) = ( 21 x 609 ) / 609

GCD(21, 609) = 12789 / 609

GCD(21, 609) = 21

Step2:

Here we consider the GCD from the above i.e. 21 as first number and the next as 866

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

LCM(21, 866) = 18186

GCD(21, 866) = ( 21 x 866 ) / 18186

GCD(21, 866) = 18186 / 18186

GCD(21, 866) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 247

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

LCM(1, 247) = 247

GCD(1, 247) = ( 1 x 247 ) / 247

GCD(1, 247) = 247 / 247

GCD(1, 247) = 1

GCD of 21, 609, 866, 247 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 73, 507, 247, 144
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• GCD of 54, 335, 224, 207
• GCD of 27, 576, 923, 698
• GCD of 89, 605, 391, 822

1. What is the GCD of 21, 609, 866, 247?

GCD of 21, 609, 866, 247 is 1

2. Where do I get the detailed procedure to find GCD of 21, 609, 866, 247?

You can find a detailed procedure to find GCD of 21, 609, 866, 247 on our page.

3. How to find GCD of 21, 609, 866, 247 on a calculator?

You can find the GCD of 21, 609, 866, 247 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.