What is the Greatest Common Factor of 20987 and 20995?

Greatest common factor (GCF) of 20987 and 20995 is 1.

GCF(20987,20995) = 1

We will now calculate the prime factors of 20987 and 20995, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20987 and 20995.

How to find the GCF of 20987 and 20995?

We will first find the prime factorization of 20987 and 20995. After we will calculate the factors of 20987 and 20995 and find the biggest common factor number .

Step-1: Prime Factorization of 20987

Prime factors of 20987 are 31, 677. Prime factorization of 20987 in exponential form is:

20987 = 31¹ × 677¹

Step-2: Prime Factorization of 20995

Prime factors of 20995 are 5, 13, 17, 19. Prime factorization of 20995 in exponential form is:

20995 = 5¹ × 13¹ × 17¹ × 19¹

Step-3: Factors of 20987

List of positive integer factors of 20987 that divides 20987 without a remainder.

1, 31, 677

Step-4: Factors of 20995

List of positive integer factors of 20995 that divides 20987 without a remainder.

1, 5, 13, 17, 19, 65, 85, 95, 221, 247, 323, 1105, 1235, 1615, 4199

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20987 and 20995. The biggest common factor number is the GCF number.
So the greatest common factor 20987 and 20995 is 1.

Also check out the Least Common Multiple of 20987 and 20995