What is the Greatest Common Factor of 78420 and 78440?

Greatest common factor (GCF) of 78420 and 78440 is 20.

GCF(78420,78440) = 20

We will now calculate the prime factors of 78420 and 78440, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 78420 and 78440.

How to find the GCF of 78420 and 78440?

We will first find the prime factorization of 78420 and 78440. After we will calculate the factors of 78420 and 78440 and find the biggest common factor number .

Step-1: Prime Factorization of 78420

Prime factors of 78420 are 2, 3, 5, 1307. Prime factorization of 78420 in exponential form is:

78420 = 2² × 3¹ × 5¹ × 1307¹

Step-2: Prime Factorization of 78440

Prime factors of 78440 are 2, 5, 37, 53. Prime factorization of 78440 in exponential form is:

78440 = 2³ × 5¹ × 37¹ × 53¹

Step-3: Factors of 78420

List of positive integer factors of 78420 that divides 78420 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 1307, 2614, 3921, 5228, 6535, 7842, 13070, 15684, 19605, 26140, 39210

Step-4: Factors of 78440

List of positive integer factors of 78440 that divides 78420 without a remainder.

1, 2, 4, 5, 8, 10, 20, 37, 40, 53, 74, 106, 148, 185, 212, 265, 296, 370, 424, 530, 740, 1060, 1480, 1961, 2120, 3922, 7844, 9805, 15688, 19610, 39220

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 78420 and 78440. The biggest common factor number is the GCF number.
So the greatest common factor 78420 and 78440 is 20.

Also check out the Least Common Multiple of 78420 and 78440