What is the Greatest Common Factor of 20705 and 20721?

Greatest common factor (GCF) of 20705 and 20721 is 1.

GCF(20705,20721) = 1

We will now calculate the prime factors of 20705 and 20721, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20705 and 20721.

How to find the GCF of 20705 and 20721?

We will first find the prime factorization of 20705 and 20721. After we will calculate the factors of 20705 and 20721 and find the biggest common factor number .

Step-1: Prime Factorization of 20705

Prime factors of 20705 are 5, 41, 101. Prime factorization of 20705 in exponential form is:

20705 = 5¹ × 41¹ × 101¹

Step-2: Prime Factorization of 20721

Prime factors of 20721 are 3, 6907. Prime factorization of 20721 in exponential form is:

20721 = 3¹ × 6907¹

Step-3: Factors of 20705

List of positive integer factors of 20705 that divides 20705 without a remainder.

1, 5, 41, 101, 205, 505, 4141

Step-4: Factors of 20721

List of positive integer factors of 20721 that divides 20705 without a remainder.

1, 3, 6907

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20705 and 20721. The biggest common factor number is the GCF number.
So the greatest common factor 20705 and 20721 is 1.

Also check out the Least Common Multiple of 20705 and 20721