18250920 has 160 divisors (see below), whose sum is σ = 63249120. Its totient is φ = 4717440.

The previous prime is 18250919. The next prime is 18250927. The reversal of 18250920 is 2905281.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18250927) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 139255 + ... + 139385.

It is an arithmetic number, because the mean of its divisors is an integer number (395307).

Almost surely, 2^18250920 is an apocalyptic number.

18250920 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 18250920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31624560).

18250920 is an abundant number, since it is smaller than the sum of its proper divisors (44998200).

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

18250920 is a wasteful number, since it uses less digits than its factorization.

18250920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 18250920 is about 4272.1095491572. The cubic root of 18250920 is about 263.2862954314.

The spelling of 18250920 in words is "eighteen million, two hundred fifty thousand, nine hundred twenty".