2021804 has 12 divisors (see below), whose sum is σ = 3553200. Its totient is φ = 1006608.

The previous prime is 2021801. The next prime is 2021807. The reversal of 2021804 is 4081202.

It is an interprime number because it is at equal distance from previous prime (2021801) and next prime (2021807).

It is not an unprimeable number, because it can be changed into a prime (2021801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (296100).

2^2021804 is an apocalyptic number.

It is an amenable number.

2021804 is a deficient number, since it is larger than the sum of its proper divisors (1531396).

2021804 is a wasteful number, since it uses less digits than its factorization.

2021804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152 (or 2150 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2021804 is about 1421.9015437083. The cubic root of 2021804 is about 126.4483064575.

The spelling of 2021804 in words is "two million, twenty-one thousand, eight hundred four".