20304330 has 32 divisors (see below), whose sum is σ = 48855744. Its totient is φ = 5400576.

The previous prime is 20304313. The next prime is 20304413. The reversal of 20304330 is 3340302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17034 + ... + 18186.

It is an arithmetic number, because the mean of its divisors is an integer number (1526742).

Almost surely, 2^20304330 is an apocalyptic number.

20304330 is an abundant number, since it is smaller than the sum of its proper divisors (28551414).

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

20304330 is a wasteful number, since it uses less digits than its factorization.

20304330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750.

The product of its (nonzero) digits is 216, while the sum is 15.

The square root of 20304330 is about 4506.0326230510. The cubic root of 20304330 is about 272.8116346090.

Adding to 20304330 its reverse (3340302), we get a palindrome (23644632).

The spelling of 20304330 in words is "twenty million, three hundred four thousand, three hundred thirty".