18265920 has 112 divisors (see below), whose sum is σ = 59253120. Its totient is φ = 4765696.

The previous prime is 18265889. The next prime is 18265931. The reversal of 18265920 is 2956281.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50701 + ... + 51059.

Almost surely, 2^18265920 is an apocalyptic number.

18265920 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 18265920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29626560).

18265920 is an abundant number, since it is smaller than the sum of its proper divisors (40987200).

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

18265920 is a wasteful number, since it uses less digits than its factorization.

18265920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 18265920 is about 4273.8647615478. The cubic root of 18265920 is about 263.3584052754.

The spelling of 18265920 in words is "eighteen million, two hundred sixty-five thousand, nine hundred twenty".