What is the Greatest Common Factor of 21870 and 21887?

Greatest common factor (GCF) of 21870 and 21887 is 1.

GCF(21870,21887) = 1

We will now calculate the prime factors of 21870 and 21887, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21870 and 21887.

How to find the GCF of 21870 and 21887?

We will first find the prime factorization of 21870 and 21887. After we will calculate the factors of 21870 and 21887 and find the biggest common factor number .

Step-1: Prime Factorization of 21870

Prime factors of 21870 are 2, 3, 5. Prime factorization of 21870 in exponential form is:

21870 = 2¹ × 3⁷ × 5¹

Step-2: Prime Factorization of 21887

Prime factors of 21887 are 43, 509. Prime factorization of 21887 in exponential form is:

21887 = 43¹ × 509¹

Step-3: Factors of 21870

List of positive integer factors of 21870 that divides 21870 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 243, 270, 405, 486, 729, 810, 1215, 1458, 2187, 2430, 3645, 4374, 7290, 10935

Step-4: Factors of 21887

List of positive integer factors of 21887 that divides 21870 without a remainder.

1, 43, 509

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21870 and 21887. The biggest common factor number is the GCF number.
So the greatest common factor 21870 and 21887 is 1.

Also check out the Least Common Multiple of 21870 and 21887