What is the Greatest Common Factor of 19971 and 19986?

Greatest common factor (GCF) of 19971 and 19986 is 3.

GCF(19971,19986) = 3

We will now calculate the prime factors of 19971 and 19986, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19971 and 19986.

How to find the GCF of 19971 and 19986?

We will first find the prime factorization of 19971 and 19986. After we will calculate the factors of 19971 and 19986 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 19986

Prime factors of 19986 are 2, 3, 3331. Prime factorization of 19986 in exponential form is:

19986 = 2¹ × 3¹ × 3331¹

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 19986

List of positive integer factors of 19986 that divides 19971 without a remainder.

1, 2, 3, 6, 3331, 6662, 9993

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19971 and 19986. The biggest common factor number is the GCF number.
So the greatest common factor 19971 and 19986 is 3.

Also check out the Least Common Multiple of 19971 and 19986