18783920 has 20 divisors (see below), whose sum is σ = 43672800. Its totient is φ = 7513536.

The previous prime is 18783911. The next prime is 18783943. The reversal of 18783920 is 2938781.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117320 + ... + 117479.

It is an arithmetic number, because the mean of its divisors is an integer number (2183640).

Almost surely, 2^18783920 is an apocalyptic number.

18783920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18783920 is an abundant number, since it is smaller than the sum of its proper divisors (24888880).

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

18783920 is a wasteful number, since it uses less digits than its factorization.

18783920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234812 (or 234806 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 18783920 is about 4334.0419933360. The cubic root of 18783920 is about 265.8247474704.

The spelling of 18783920 in words is "eighteen million, seven hundred eighty-three thousand, nine hundred twenty".