18361320 has 64 divisors (see below), whose sum is σ = 56142720. Its totient is φ = 4802304.

The previous prime is 18361319. The next prime is 18361333. The reversal of 18361320 is 2316381.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 4917 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (877230).

Almost surely, 2^18361320 is an apocalyptic number.

18361320 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 18361320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28071360).

18361320 is an abundant number, since it is smaller than the sum of its proper divisors (37781400).

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

18361320 is a wasteful number, since it uses less digits than its factorization.

18361320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954 (or 2950 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18361320 is about 4285.0110851665. The cubic root of 18361320 is about 263.8161024167.

It can be divided in two parts, 18361 and 320, that added together give a palindrome (18681).

The spelling of 18361320 in words is "eighteen million, three hundred sixty-one thousand, three hundred twenty".