18020604 has 24 divisors (see below), whose sum is σ = 48055168. Its totient is φ = 5148720.

The previous prime is 18020573. The next prime is 18020623. The reversal of 18020604 is 40602081.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 107182 + ... + 107349.

Almost surely, 2^18020604 is an apocalyptic number.

18020604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18020604 is an abundant number, since it is smaller than the sum of its proper divisors (30034564).

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

18020604 is a wasteful number, since it uses less digits than its factorization.

18020604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214545 (or 214543 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18020604 is about 4245.0681973321. The cubic root of 18020604 is about 262.1740971350.

Adding to 18020604 its reverse (40602081), we get a palindrome (58622685).

The spelling of 18020604 in words is "eighteen million, twenty thousand, six hundred four".