18273920 has 64 divisors (see below), whose sum is σ = 49939200. Its totient is φ = 6263808.

The previous prime is 18273919. The next prime is 18273943. The reversal of 18273920 is 2937281.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2441 + ... + 6519.

It is an arithmetic number, because the mean of its divisors is an integer number (780300).

Almost surely, 2^18273920 is an apocalyptic number.

18273920 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 18273920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24969600).

18273920 is an abundant number, since it is smaller than the sum of its proper divisors (31665280).

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

18273920 is an equidigital number, since it uses as much as digits as its factorization.

18273920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105 (or 4093 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18273920 is about 4274.8005801441. The cubic root of 18273920 is about 263.3968477178.

The spelling of 18273920 in words is "eighteen million, two hundred seventy-three thousand, nine hundred twenty".