What is the Greatest Common Factor of 20991 and 21001?

Greatest common factor (GCF) of 20991 and 21001 is 1.

GCF(20991,21001) = 1

We will now calculate the prime factors of 20991 and 21001, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20991 and 21001.

How to find the GCF of 20991 and 21001?

We will first find the prime factorization of 20991 and 21001. After we will calculate the factors of 20991 and 21001 and find the biggest common factor number .

Step-1: Prime Factorization of 20991

Prime factors of 20991 are 3, 6997. Prime factorization of 20991 in exponential form is:

20991 = 3¹ × 6997¹

Step-2: Prime Factorization of 21001

Prime factors of 21001 are 21001. Prime factorization of 21001 in exponential form is:

21001 = 21001¹

Step-3: Factors of 20991

List of positive integer factors of 20991 that divides 20991 without a remainder.

1, 3, 6997

Step-4: Factors of 21001

List of positive integer factors of 21001 that divides 20991 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20991 and 21001. The biggest common factor number is the GCF number.
So the greatest common factor 20991 and 21001 is 1.

Also check out the Least Common Multiple of 20991 and 21001