20304473 has 12 divisors (see below), whose sum is σ = 24383232. Its totient is φ = 16841160.

The previous prime is 20304463. The next prime is 20304481. The reversal of 20304473 is 37440302.

It is a happy number.

It is not a de Polignac number, because 20304473 - 2⁴ = 20304457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20304413) 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 11 ways as a sum of consecutive naturals, for example, 5165 + ... + 8202.

It is an arithmetic number, because the mean of its divisors is an integer number (2031936).

Almost surely, 2^20304473 is an apocalyptic number.

It is an amenable number.

20304473 is a deficient number, since it is larger than the sum of its proper divisors (4078759).

20304473 is a wasteful number, since it uses less digits than its factorization.

20304473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13412 (or 13405 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 23.

The square root of 20304473 is about 4506.0484906401. The cubic root of 20304473 is about 272.8122750630.

Adding to 20304473 its reverse (37440302), we get a palindrome (57744775).

The spelling of 20304473 in words is "twenty million, three hundred four thousand, four hundred seventy-three".