What is the Greatest Common Factor of 20425 and 20440?

Greatest common factor (GCF) of 20425 and 20440 is 5.

GCF(20425,20440) = 5

We will now calculate the prime factors of 20425 and 20440, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20425 and 20440.

How to find the GCF of 20425 and 20440?

We will first find the prime factorization of 20425 and 20440. After we will calculate the factors of 20425 and 20440 and find the biggest common factor number .

Step-1: Prime Factorization of 20425

Prime factors of 20425 are 5, 19, 43. Prime factorization of 20425 in exponential form is:

20425 = 5² × 19¹ × 43¹

Step-2: Prime Factorization of 20440

Prime factors of 20440 are 2, 5, 7, 73. Prime factorization of 20440 in exponential form is:

20440 = 2³ × 5¹ × 7¹ × 73¹

Step-3: Factors of 20425

List of positive integer factors of 20425 that divides 20425 without a remainder.

1, 5, 19, 25, 43, 95, 215, 475, 817, 1075, 4085

Step-4: Factors of 20440

List of positive integer factors of 20440 that divides 20425 without a remainder.

1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 73, 140, 146, 280, 292, 365, 511, 584, 730, 1022, 1460, 2044, 2555, 2920, 4088, 5110, 10220

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20425 and 20440. The biggest common factor number is the GCF number.
So the greatest common factor 20425 and 20440 is 5.

Also check out the Least Common Multiple of 20425 and 20440