18263920 has 20 divisors (see below), whose sum is σ = 42463800. Its totient is φ = 7305536.

The previous prime is 18263911. The next prime is 18263951. The reversal of 18263920 is 2936281.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-4 number, since 4×18263920⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

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, 114070 + ... + 114229.

It is an arithmetic number, because the mean of its divisors is an integer number (2123190).

Almost surely, 2^18263920 is an apocalyptic number.

18263920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18263920 is an abundant number, since it is smaller than the sum of its proper divisors (24199880).

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

18263920 is a wasteful number, since it uses less digits than its factorization.

18263920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228312 (or 228306 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18263920 is about 4273.6307748798. The cubic root of 18263920 is about 263.3487929110.

The spelling of 18263920 in words is "eighteen million, two hundred sixty-three thousand, nine hundred twenty".