18256600420 has 48 divisors (see below), whose sum is σ = 38806614000. Its totient is φ = 7213875200.

The previous prime is 18256600379. The next prime is 18256600447. The reversal of 18256600420 is 2400665281.

It can be written as a sum of positive squares in 8 ways, for example, as 4319381284 + 13937219136 = 65722^2 + 118056^2 .

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, 896916 + ... + 917044.

It is an arithmetic number, because the mean of its divisors is an integer number (808471125).

Almost surely, 2^18256600420 is an apocalyptic number.

18256600420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18256600420 is an abundant number, since it is smaller than the sum of its proper divisors (20550013580).

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

18256600420 is a wasteful number, since it uses less digits than its factorization.

18256600420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20688 (or 20686 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 18256600420 in words is "eighteen billion, two hundred fifty-six million, six hundred thousand, four hundred twenty".