What is the Greatest Common Factor of 21745 and 21760?

Greatest common factor (GCF) of 21745 and 21760 is 5.

GCF(21745,21760) = 5

We will now calculate the prime factors of 21745 and 21760, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21745 and 21760.

How to find the GCF of 21745 and 21760?

We will first find the prime factorization of 21745 and 21760. After we will calculate the factors of 21745 and 21760 and find the biggest common factor number .

Step-1: Prime Factorization of 21745

Prime factors of 21745 are 5, 4349. Prime factorization of 21745 in exponential form is:

21745 = 5¹ × 4349¹

Step-2: Prime Factorization of 21760

Prime factors of 21760 are 2, 5, 17. Prime factorization of 21760 in exponential form is:

21760 = 2⁸ × 5¹ × 17¹

Step-3: Factors of 21745

List of positive integer factors of 21745 that divides 21745 without a remainder.

1, 5, 4349

Step-4: Factors of 21760

List of positive integer factors of 21760 that divides 21745 without a remainder.

1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 256, 272, 320, 340, 544, 640, 680, 1088, 1280, 1360, 2176, 2720, 4352, 5440, 10880

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21745 and 21760. The biggest common factor number is the GCF number.
So the greatest common factor 21745 and 21760 is 5.

Also check out the Least Common Multiple of 21745 and 21760