What is the Greatest Common Factor of 81420 and 81438?

Greatest common factor (GCF) of 81420 and 81438 is 6.

GCF(81420,81438) = 6

We will now calculate the prime factors of 81420 and 81438, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81420 and 81438.

How to find the GCF of 81420 and 81438?

We will first find the prime factorization of 81420 and 81438. After we will calculate the factors of 81420 and 81438 and find the biggest common factor number .

Step-1: Prime Factorization of 81420

Prime factors of 81420 are 2, 3, 5, 23, 59. Prime factorization of 81420 in exponential form is:

81420 = 2² × 3¹ × 5¹ × 23¹ × 59¹

Step-2: Prime Factorization of 81438

Prime factors of 81438 are 2, 3, 7, 277. Prime factorization of 81438 in exponential form is:

81438 = 2¹ × 3¹ × 7² × 277¹

Step-3: Factors of 81420

List of positive integer factors of 81420 that divides 81420 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 23, 30, 46, 59, 60, 69, 92, 115, 118, 138, 177, 230, 236, 276, 295, 345, 354, 460, 590, 690, 708, 885, 1180, 1357, 1380, 1770, 2714, 3540, 4071, 5428, 6785, 8142, 13570, 16284, 20355, 27140, 40710

Step-4: Factors of 81438

List of positive integer factors of 81438 that divides 81420 without a remainder.

1, 2, 3, 6, 7, 14, 21, 42, 49, 98, 147, 277, 294, 554, 831, 1662, 1939, 3878, 5817, 11634, 13573, 27146, 40719

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81420 and 81438. The biggest common factor number is the GCF number.
So the greatest common factor 81420 and 81438 is 6.

Also check out the Least Common Multiple of 81420 and 81438