What is the Greatest Common Factor of 21420 and 21431?

Greatest common factor (GCF) of 21420 and 21431 is 1.

GCF(21420,21431) = 1

We will now calculate the prime factors of 21420 and 21431, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21420 and 21431.

How to find the GCF of 21420 and 21431?

We will first find the prime factorization of 21420 and 21431. After we will calculate the factors of 21420 and 21431 and find the biggest common factor number .

Step-1: Prime Factorization of 21420

Prime factors of 21420 are 2, 3, 5, 7, 17. Prime factorization of 21420 in exponential form is:

21420 = 2² × 3² × 5¹ × 7¹ × 17¹

Step-2: Prime Factorization of 21431

Prime factors of 21431 are 29, 739. Prime factorization of 21431 in exponential form is:

21431 = 29¹ × 739¹

Step-3: Factors of 21420

List of positive integer factors of 21420 that divides 21420 without a remainder.

1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 17, 18, 20, 21, 28, 30, 34, 35, 36, 42, 45, 51, 60, 63, 68, 70, 84, 85, 90, 102, 105, 119, 126, 140, 153, 170, 180, 204, 210, 238, 252, 255, 306, 315, 340, 357, 420, 476, 510, 595, 612, 630, 714, 765, 1020, 1071, 1190, 1260, 1428, 1530, 1785, 2142, 2380, 3060, 3570, 4284, 5355, 7140, 10710

Step-4: Factors of 21431

List of positive integer factors of 21431 that divides 21420 without a remainder.

1, 29, 739

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21420 and 21431. The biggest common factor number is the GCF number.
So the greatest common factor 21420 and 21431 is 1.

Also check out the Least Common Multiple of 21420 and 21431