What is the Greatest Common Factor of 19971 and 19981?

Greatest common factor (GCF) of 19971 and 19981 is 1.

GCF(19971,19981) = 1

We will now calculate the prime factors of 19971 and 19981, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19971 and 19981.

How to find the GCF of 19971 and 19981?

We will first find the prime factorization of 19971 and 19981. After we will calculate the factors of 19971 and 19981 and find the biggest common factor number .

Step-1: Prime Factorization of 19971

Prime factors of 19971 are 3, 7, 317. Prime factorization of 19971 in exponential form is:

19971 = 3² × 7¹ × 317¹

Step-2: Prime Factorization of 19981

Prime factors of 19981 are 13, 29, 53. Prime factorization of 19981 in exponential form is:

19981 = 13¹ × 29¹ × 53¹

Step-3: Factors of 19971

List of positive integer factors of 19971 that divides 19971 without a remainder.

1, 3, 7, 9, 21, 63, 317, 951, 2219, 2853, 6657

Step-4: Factors of 19981

List of positive integer factors of 19981 that divides 19971 without a remainder.

1, 13, 29, 53, 377, 689, 1537

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19971 and 19981. The biggest common factor number is the GCF number.
So the greatest common factor 19971 and 19981 is 1.

Also check out the Least Common Multiple of 19971 and 19981