18515034420 has 24 divisors (see below), whose sum is σ = 51842096544. Its totient is φ = 4937342496.

The previous prime is 18515034413. The next prime is 18515034449. The reversal of 18515034420 is 2443051581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154291894 + ... + 154292013.

It is an arithmetic number, because the mean of its divisors is an integer number (2160087356).

Almost surely, 2^18515034420 is an apocalyptic number.

18515034420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18515034420 is an abundant number, since it is smaller than the sum of its proper divisors (33327062124).

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

18515034420 is a wasteful number, since it uses less digits than its factorization.

18515034420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308583919 (or 308583917 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 18515034420 in words is "eighteen billion, five hundred fifteen million, thirty-four thousand, four hundred twenty".