What is the Greatest Common Factor of 21765 and 21781?

Greatest common factor (GCF) of 21765 and 21781 is 1.

GCF(21765,21781) = 1

We will now calculate the prime factors of 21765 and 21781, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21765 and 21781.

How to find the GCF of 21765 and 21781?

We will first find the prime factorization of 21765 and 21781. After we will calculate the factors of 21765 and 21781 and find the biggest common factor number .

Step-1: Prime Factorization of 21765

Prime factors of 21765 are 3, 5, 1451. Prime factorization of 21765 in exponential form is:

21765 = 3¹ × 5¹ × 1451¹

Step-2: Prime Factorization of 21781

Prime factors of 21781 are 23, 947. Prime factorization of 21781 in exponential form is:

21781 = 23¹ × 947¹

Step-3: Factors of 21765

List of positive integer factors of 21765 that divides 21765 without a remainder.

1, 3, 5, 15, 1451, 4353, 7255

Step-4: Factors of 21781

List of positive integer factors of 21781 that divides 21765 without a remainder.

1, 23, 947

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21765 and 21781. The biggest common factor number is the GCF number.
So the greatest common factor 21765 and 21781 is 1.

Also check out the Least Common Multiple of 21765 and 21781