What is the Greatest Common Factor of 21655 and 21665?

Greatest common factor (GCF) of 21655 and 21665 is 5.

GCF(21655,21665) = 5

We will now calculate the prime factors of 21655 and 21665, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21655 and 21665.

How to find the GCF of 21655 and 21665?

We will first find the prime factorization of 21655 and 21665. After we will calculate the factors of 21655 and 21665 and find the biggest common factor number .

Step-1: Prime Factorization of 21655

Prime factors of 21655 are 5, 61, 71. Prime factorization of 21655 in exponential form is:

21655 = 5¹ × 61¹ × 71¹

Step-2: Prime Factorization of 21665

Prime factors of 21665 are 5, 7, 619. Prime factorization of 21665 in exponential form is:

21665 = 5¹ × 7¹ × 619¹

Step-3: Factors of 21655

List of positive integer factors of 21655 that divides 21655 without a remainder.

1, 5, 61, 71, 305, 355, 4331

Step-4: Factors of 21665

List of positive integer factors of 21665 that divides 21655 without a remainder.

1, 5, 7, 35, 619, 3095, 4333

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21655 and 21665. The biggest common factor number is the GCF number.
So the greatest common factor 21655 and 21665 is 5.

Also check out the Least Common Multiple of 21655 and 21665