What is the Greatest Common Factor of 19721 and 19729?

Greatest common factor (GCF) of 19721 and 19729 is 1.

GCF(19721,19729) = 1

We will now calculate the prime factors of 19721 and 19729, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19721 and 19729.

How to find the GCF of 19721 and 19729?

We will first find the prime factorization of 19721 and 19729. After we will calculate the factors of 19721 and 19729 and find the biggest common factor number .

Step-1: Prime Factorization of 19721

Prime factors of 19721 are 13, 37, 41. Prime factorization of 19721 in exponential form is:

19721 = 13¹ × 37¹ × 41¹

Step-2: Prime Factorization of 19729

Prime factors of 19729 are 109, 181. Prime factorization of 19729 in exponential form is:

19729 = 109¹ × 181¹

Step-3: Factors of 19721

List of positive integer factors of 19721 that divides 19721 without a remainder.

1, 13, 37, 41, 481, 533, 1517

Step-4: Factors of 19729

List of positive integer factors of 19729 that divides 19721 without a remainder.

1, 109, 181

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19721 and 19729. The biggest common factor number is the GCF number.
So the greatest common factor 19721 and 19729 is 1.

Also check out the Least Common Multiple of 19721 and 19729