20

The number 20 is a positive integer that follows 19 and precedes 21. It is often used to count or measure quantities, such as twenty items or twenty minutes. In mathematics, 20 is an even number, divisible by 1, 2, 4, 5, 10, and 20 itself. It is commonly associated with multiple systems, like the base-20 counting system historically used in some cultures. Additionally, 20 appears in everyday contexts, such as age milestones, scoring systems, and timekeeping, making it a familiar and practical number in daily life.