18043920 has 120 divisors (see below), whose sum is σ = 63835200. Its totient is φ = 4555008.

The previous prime is 18043913. The next prime is 18043931. The reversal of 18043920 is 2934081.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13021 + ... + 14339.

It is an arithmetic number, because the mean of its divisors is an integer number (531960).

Almost surely, 2^18043920 is an apocalyptic number.

18043920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18043920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31917600).

18043920 is an abundant number, since it is smaller than the sum of its proper divisors (45791280).

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

18043920 is a wasteful number, since it uses less digits than its factorization.

18043920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18043920 is about 4247.8135552305. The cubic root of 18043920 is about 262.2871199240.

It can be divided in two parts, 180 and 43920, that added together give a square (44100 = 210²).

The spelling of 18043920 in words is "eighteen million, forty-three thousand, nine hundred twenty".