18804020 has 12 divisors (see below), whose sum is σ = 39488484. Its totient is φ = 7521600.

The previous prime is 18804017. The next prime is 18804031. The reversal of 18804020 is 2040881.

It can be written as a sum of positive squares in 2 ways, for example, as 2579236 + 16224784 = 1606^2 + 4028^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470081 + ... + 470120.

It is an arithmetic number, because the mean of its divisors is an integer number (3290707).

Almost surely, 2^18804020 is an apocalyptic number.

18804020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18804020 is an abundant number, since it is smaller than the sum of its proper divisors (20684464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18804020 is a wasteful number, since it uses less digits than its factorization.

18804020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940210 (or 940208 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 18804020 is about 4336.3602248891. The cubic root of 18804020 is about 265.9195301843.

The spelling of 18804020 in words is "eighteen million, eight hundred four thousand, twenty".