18353920 has 72 divisors (see below), whose sum is σ = 47388096. Its totient is φ = 6770688.

The previous prime is 18353869. The next prime is 18353927. The reversal of 18353920 is 2935381.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18353927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16089 + ... + 17191.

It is an arithmetic number, because the mean of its divisors is an integer number (658168).

Almost surely, 2^18353920 is an apocalyptic number.

18353920 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 18353920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23694048).

18353920 is an abundant number, since it is smaller than the sum of its proper divisors (29034176).

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

18353920 is a wasteful number, since it uses less digits than its factorization.

18353920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 18353920 is about 4284.1475231369. The cubic root of 18353920 is about 263.7806564996.

The spelling of 18353920 in words is "eighteen million, three hundred fifty-three thousand, nine hundred twenty".