18494020 has 24 divisors (see below), whose sum is σ = 39241944. Its totient is φ = 7320576.

The previous prime is 18493997. The next prime is 18494033. The reversal of 18494020 is 2049481.

It can be written as a sum of positive squares in 4 ways, for example, as 244036 + 18249984 = 494^2 + 4272^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18494020.

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, 2827 + ... + 6706.

It is an arithmetic number, because the mean of its divisors is an integer number (1635081).

Almost surely, 2^18494020 is an apocalyptic number.

18494020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18494020 is an abundant number, since it is smaller than the sum of its proper divisors (20747924).

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

18494020 is a wasteful number, since it uses less digits than its factorization.

18494020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9639 (or 9637 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18494020 is about 4300.4674164560. The cubic root of 18494020 is about 264.4501235876.

The spelling of 18494020 in words is "eighteen million, four hundred ninety-four thousand, twenty".