18000920 has 64 divisors (see below), whose sum is σ = 47200320. Its totient is φ = 6050304.

The previous prime is 18000919. The next prime is 18000937. The reversal of 18000920 is 2900081.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 18000892 and 18000901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14234 + ... + 15446.

It is an arithmetic number, because the mean of its divisors is an integer number (737505).

Almost surely, 2^18000920 is an apocalyptic number.

18000920 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 18000920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23600160).

18000920 is an abundant number, since it is smaller than the sum of its proper divisors (29199400).

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

18000920 is a wasteful number, since it uses less digits than its factorization.

18000920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 18000920 is about 4242.7491087737. The cubic root of 18000920 is about 262.0786043116.

The spelling of 18000920 in words is "eighteen million, nine hundred twenty", and thus it is an aban number.