2820

2820 is a natural number that follows 2819 and precedes 2821. In mathematics, it is an even composite number.

Its prime factorization is 2^2 × 3 × 5 × 47, which implies a range of divisors including 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 47, 94, 141, 188, 235, 282, 470, 705, 940, 1410, and 2820. The digit sum is 12, so 2820 is a Harshad (Niven) number, since 2820 divided by 12 equals 235. In Roman numerals it is written as MMDCCCXX. In binary it is 101100000100, and in hexadecimal it is B04 (often written as 0xB04).

As a calendar year, 2820 CE would occur in the third millennium of the common era. If used in the BCE era, 2820 BCE would be a date several millennia before the present. Beyond numerical properties, 2820 may appear as a catalog or model number in various contexts, but no single widely recognized historical event or designation is universally associated with the number itself.

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