What is the Greatest Common Factor of 21703 and 21720?

Greatest common factor (GCF) of 21703 and 21720 is 1.

GCF(21703,21720) = 1

We will now calculate the prime factors of 21703 and 21720, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21703 and 21720.

How to find the GCF of 21703 and 21720?

We will first find the prime factorization of 21703 and 21720. After we will calculate the factors of 21703 and 21720 and find the biggest common factor number .

Step-1: Prime Factorization of 21703

Prime factors of 21703 are 11, 1973. Prime factorization of 21703 in exponential form is:

21703 = 11¹ × 1973¹

Step-2: Prime Factorization of 21720

Prime factors of 21720 are 2, 3, 5, 181. Prime factorization of 21720 in exponential form is:

21720 = 2³ × 3¹ × 5¹ × 181¹

Step-3: Factors of 21703

List of positive integer factors of 21703 that divides 21703 without a remainder.

1, 11, 1973

Step-4: Factors of 21720

List of positive integer factors of 21720 that divides 21703 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 181, 362, 543, 724, 905, 1086, 1448, 1810, 2172, 2715, 3620, 4344, 5430, 7240, 10860

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21703 and 21720. The biggest common factor number is the GCF number.
So the greatest common factor 21703 and 21720 is 1.

Also check out the Least Common Multiple of 21703 and 21720