18703368520 has 64 divisors (see below), whose sum is σ = 43269085440. Its totient is φ = 7271769600.

The previous prime is 18703368511. The next prime is 18703368553. The reversal of 18703368520 is 2586330781.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423399 + ... + 465481.

It is an arithmetic number, because the mean of its divisors is an integer number (676079460).

Almost surely, 2^18703368520 is an apocalyptic number.

18703368520 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 18703368520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21634542720).

18703368520 is an abundant number, since it is smaller than the sum of its proper divisors (24565716920).

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

18703368520 is a wasteful number, since it uses less digits than its factorization.

18703368520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42406 (or 42402 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 18703368520 in words is "eighteen billion, seven hundred three million, three hundred sixty-eight thousand, five hundred twenty".