What is the HCF of 20 and 24?

The Highest Common Factor (HCF) of 20 and 24 is the largest number that divides both 20 and 24 without leaving a remainder. To find the HCF, you can list the factors of each number and identify the highest number they have in common. The factors of 20 are 1, 2, 4, 5, 10, and 20, while the factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24. The highest common factor of 20 and 24 is 4.