18573820 has 24 divisors (see below), whose sum is σ = 39958128. Its totient is φ = 7248000.

The previous prime is 18573803. The next prime is 18573827. The reversal of 18573820 is 2837581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18573827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10506 + ... + 12145.

It is an arithmetic number, because the mean of its divisors is an integer number (1664922).

Almost surely, 2^18573820 is an apocalyptic number.

18573820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18573820 is an abundant number, since it is smaller than the sum of its proper divisors (21384308).

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

18573820 is a wasteful number, since it uses less digits than its factorization.

18573820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22701 (or 22699 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 18573820 is about 4309.7354907233. The cubic root of 18573820 is about 264.8299371659.

The spelling of 18573820 in words is "eighteen million, five hundred seventy-three thousand, eight hundred twenty".