What is the Greatest Common Factor of 20971 and 20990?

Greatest common factor (GCF) of 20971 and 20990 is 1.

GCF(20971,20990) = 1

We will now calculate the prime factors of 20971 and 20990, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20971 and 20990.

How to find the GCF of 20971 and 20990?

We will first find the prime factorization of 20971 and 20990. After we will calculate the factors of 20971 and 20990 and find the biggest common factor number .

Step-1: Prime Factorization of 20971

Prime factors of 20971 are 67, 313. Prime factorization of 20971 in exponential form is:

20971 = 67¹ × 313¹

Step-2: Prime Factorization of 20990

Prime factors of 20990 are 2, 5, 2099. Prime factorization of 20990 in exponential form is:

20990 = 2¹ × 5¹ × 2099¹

Step-3: Factors of 20971

List of positive integer factors of 20971 that divides 20971 without a remainder.

1, 67, 313

Step-4: Factors of 20990

List of positive integer factors of 20990 that divides 20971 without a remainder.

1, 2, 5, 10, 2099, 4198, 10495

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20971 and 20990. The biggest common factor number is the GCF number.
So the greatest common factor 20971 and 20990 is 1.

Also check out the Least Common Multiple of 20971 and 20990