620

620 is a natural number that follows 619 and precedes 621. It is an even, composite integer, not prime and not a perfect power of a single prime.

Its prime factorization is 2^2 × 5 × 31. The positive divisors of 620 are 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, and 620. The sum of all divisors is 1344, so the sum of proper divisors is 724. These factors make 620 a multiple of 4, 5, and 31, among others.

In various representations, 620 is written as 1001101100 in binary, 0x26C in hexadecimal, and 0o1154 in octal. In Roman numerals, 620 is DCXX (D = 500, C = 100, XX = 20).

As a calendar year, 620 CE falls in the early medieval period, while 620 BCE appears in ancient history contexts. The specific events of those years vary by region and historical source.

In modern usage, 620 is also used as a telephone area code in the United States, representing a region of southern Kansas. It appears in road designations and product model numbers in various contexts, reflecting its role as a commonly used numeric label.