18020304 has 30 divisors (see below), whose sum is σ = 50432226. Its totient is φ = 6006720.

The previous prime is 18020267. The next prime is 18020309. The reversal of 18020304 is 40302081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15586704 + 2433600 = 3948^2 + 1560^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62427 + ... + 62714.

Almost surely, 2^18020304 is an apocalyptic number.

It is an amenable number.

18020304 is an abundant number, since it is smaller than the sum of its proper divisors (32411922).

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

18020304 is a wasteful number, since it uses less digits than its factorization.

18020304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125155 (or 125146 counting only the distinct ones).

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

The square root of 18020304 is about 4245.0328620636. The cubic root of 18020304 is about 262.1726422695.

Adding to 18020304 its reverse (40302081), we get a palindrome (58322385).

The spelling of 18020304 in words is "eighteen million, twenty thousand, three hundred four".