18913920 has 64 divisors (see below), whose sum is σ = 60294240. Its totient is φ = 5043200.

The previous prime is 18913913. The next prime is 18913927. The reversal of 18913920 is 2931981.

It is an interprime number because it is at equal distance from previous prime (18913913) and next prime (18913927).

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

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913927) 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, 3006 + ... + 6845.

Almost surely, 2^18913920 is an apocalyptic number.

18913920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18913920 is an abundant number, since it is smaller than the sum of its proper divisors (41380320).

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

18913920 is an equidigital number, since it uses as much as digits as its factorization.

18913920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9873 (or 9861 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 18913920 is about 4349.0136812845. The cubic root of 18913920 is about 266.4365793092.

The spelling of 18913920 in words is "eighteen million, nine hundred thirteen thousand, nine hundred twenty".