What is the Greatest Common Factor of 15420 and 15440?

Greatest common factor (GCF) of 15420 and 15440 is 20.

GCF(15420,15440) = 20

We will now calculate the prime factors of 15420 and 15440, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15420 and 15440.

How to find the GCF of 15420 and 15440?

We will first find the prime factorization of 15420 and 15440. After we will calculate the factors of 15420 and 15440 and find the biggest common factor number .

Step-1: Prime Factorization of 15420

Prime factors of 15420 are 2, 3, 5, 257. Prime factorization of 15420 in exponential form is:

15420 = 2² × 3¹ × 5¹ × 257¹

Step-2: Prime Factorization of 15440

Prime factors of 15440 are 2, 5, 193. Prime factorization of 15440 in exponential form is:

15440 = 2⁴ × 5¹ × 193¹

Step-3: Factors of 15420

List of positive integer factors of 15420 that divides 15420 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 257, 514, 771, 1028, 1285, 1542, 2570, 3084, 3855, 5140, 7710

Step-4: Factors of 15440

List of positive integer factors of 15440 that divides 15420 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 193, 386, 772, 965, 1544, 1930, 3088, 3860, 7720

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15420 and 15440. The biggest common factor number is the GCF number.
So the greatest common factor 15420 and 15440 is 20.

Also check out the Least Common Multiple of 15420 and 15440