What is the Greatest Common Factor of 39715 and 39720?

Greatest common factor (GCF) of 39715 and 39720 is 5.

GCF(39715,39720) = 5

We will now calculate the prime factors of 39715 and 39720, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 39715 and 39720.

How to find the GCF of 39715 and 39720?

We will first find the prime factorization of 39715 and 39720. After we will calculate the factors of 39715 and 39720 and find the biggest common factor number .

Step-1: Prime Factorization of 39715

Prime factors of 39715 are 5, 13, 47. Prime factorization of 39715 in exponential form is:

39715 = 5¹ × 13² × 47¹

Step-2: Prime Factorization of 39720

Prime factors of 39720 are 2, 3, 5, 331. Prime factorization of 39720 in exponential form is:

39720 = 2³ × 3¹ × 5¹ × 331¹

Step-3: Factors of 39715

List of positive integer factors of 39715 that divides 39715 without a remainder.

1, 5, 13, 47, 65, 169, 235, 611, 845, 3055, 7943

Step-4: Factors of 39720

List of positive integer factors of 39720 that divides 39715 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 331, 662, 993, 1324, 1655, 1986, 2648, 3310, 3972, 4965, 6620, 7944, 9930, 13240, 19860

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 39715 and 39720. The biggest common factor number is the GCF number.
So the greatest common factor 39715 and 39720 is 5.

Also check out the Least Common Multiple of 39715 and 39720