What is the Greatest Common Factor of 21965 and 21985?

Greatest common factor (GCF) of 21965 and 21985 is 5.

GCF(21965,21985) = 5

We will now calculate the prime factors of 21965 and 21985, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21965 and 21985.

How to find the GCF of 21965 and 21985?

We will first find the prime factorization of 21965 and 21985. After we will calculate the factors of 21965 and 21985 and find the biggest common factor number .

Step-1: Prime Factorization of 21965

Prime factors of 21965 are 5, 23, 191. Prime factorization of 21965 in exponential form is:

21965 = 5¹ × 23¹ × 191¹

Step-2: Prime Factorization of 21985

Prime factors of 21985 are 5, 4397. Prime factorization of 21985 in exponential form is:

21985 = 5¹ × 4397¹

Step-3: Factors of 21965

List of positive integer factors of 21965 that divides 21965 without a remainder.

1, 5, 23, 115, 191, 955, 4393

Step-4: Factors of 21985

List of positive integer factors of 21985 that divides 21965 without a remainder.

1, 5, 4397

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21965 and 21985. The biggest common factor number is the GCF number.
So the greatest common factor 21965 and 21985 is 5.

Also check out the Least Common Multiple of 21965 and 21985