18673231920 has 640 divisors, whose sum is σ = 72955330560. Its totient is φ = 3855237120.

The previous prime is 18673231903. The next prime is 18673231933. The reversal of 18673231920 is 2913237681.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 111815677 + ... + 111815843.

It is an arithmetic number, because the mean of its divisors is an integer number (113992704).

Almost surely, 2^18673231920 is an apocalyptic number.

18673231920 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 18673231920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36477665280).

18673231920 is an abundant number, since it is smaller than the sum of its proper divisors (54282098640).

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

18673231920 is a wasteful number, since it uses less digits than its factorization.

18673231920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 18673231920 in words is "eighteen billion, six hundred seventy-three million, two hundred thirty-one thousand, nine hundred twenty".