2820081 has 16 divisors (see below), whose sum is σ = 4148928. Its totient is φ = 1689600.

The previous prime is 2820071. The next prime is 2820089. The reversal of 2820081 is 1800282.

It is not a de Polignac number, because 2820081 - 2⁶ = 2820017 is a prime.

It is a super-2 number, since 2×2820081² = 15905713693122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2820089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2761 + ... + 3641.

It is an arithmetic number, because the mean of its divisors is an integer number (259308).

2^2820081 is an apocalyptic number.

It is an amenable number.

2820081 is a deficient number, since it is larger than the sum of its proper divisors (1328847).

2820081 is a wasteful number, since it uses less digits than its factorization.

2820081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 2820081 is about 1679.3096796005. The cubic root of 2820081 is about 141.2821171126.

The spelling of 2820081 in words is "two million, eight hundred twenty thousand, eighty-one".