18430020 has 72 divisors (see below), whose sum is σ = 63895104. Its totient is φ = 4212288.

The previous prime is 18429979. The next prime is 18430037. The reversal of 18430020 is 2003481.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18429975 and 18430002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6054 + ... + 8573.

It is an arithmetic number, because the mean of its divisors is an integer number (887432).

Almost surely, 2^18430020 is an apocalyptic number.

18430020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18430020 is an abundant number, since it is smaller than the sum of its proper divisors (45465084).

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

18430020 is a wasteful number, since it uses less digits than its factorization.

18430020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14649 (or 14644 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 18430020 is about 4293.0199160964. The cubic root of 18430020 is about 264.1447209271.

The spelling of 18430020 in words is "eighteen million, four hundred thirty thousand, twenty".