What is the Greatest Common Factor of 20643 and 20661?

Greatest common factor (GCF) of 20643 and 20661 is 3.

GCF(20643,20661) = 3

We will now calculate the prime factors of 20643 and 20661, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20643 and 20661.

How to find the GCF of 20643 and 20661?

We will first find the prime factorization of 20643 and 20661. After we will calculate the factors of 20643 and 20661 and find the biggest common factor number .

Step-1: Prime Factorization of 20643

Prime factors of 20643 are 3, 7, 983. Prime factorization of 20643 in exponential form is:

20643 = 3¹ × 7¹ × 983¹

Step-2: Prime Factorization of 20661

Prime factors of 20661 are 3, 71, 97. Prime factorization of 20661 in exponential form is:

20661 = 3¹ × 71¹ × 97¹

Step-3: Factors of 20643

List of positive integer factors of 20643 that divides 20643 without a remainder.

1, 3, 7, 21, 983, 2949, 6881

Step-4: Factors of 20661

List of positive integer factors of 20661 that divides 20643 without a remainder.

1, 3, 71, 97, 213, 291, 6887

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20643 and 20661. The biggest common factor number is the GCF number.
So the greatest common factor 20643 and 20661 is 3.

Also check out the Least Common Multiple of 20643 and 20661