20304456 has 32 divisors (see below), whose sum is σ = 51377760. Its totient is φ = 6685952.

The previous prime is 20304433. The next prime is 20304457. The reversal of 20304456 is 65440302.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20304457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3105 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (1605555).

Almost surely, 2^20304456 is an apocalyptic number.

It is an amenable number.

20304456 is an abundant number, since it is smaller than the sum of its proper divisors (31073304).

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

20304456 is a wasteful number, since it uses less digits than its factorization.

20304456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10285 (or 10281 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20304456 is about 4506.0466042863. The cubic root of 20304456 is about 272.8121989253.

Adding to 20304456 its reverse (65440302), we get a palindrome (85744758).

The spelling of 20304456 in words is "twenty million, three hundred four thousand, four hundred fifty-six".