20304331 has 16 divisors (see below), whose sum is σ = 22579200. Its totient is φ = 18171648.

The previous prime is 20304313. The next prime is 20304413. The reversal of 20304331 is 13340302.

It is a cyclic number.

It is not a de Polignac number, because 20304331 - 2¹¹ = 20302283 is a prime.

It is a super-2 number, since 2×20304331² = 824531714715122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20304311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42150 + ... + 42628.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^20304331 is an apocalyptic number.

20304331 is a deficient number, since it is larger than the sum of its proper divisors (2274869).

20304331 is a wasteful number, since it uses less digits than its factorization.

20304331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20304331 is about 4506.0327340134. The cubic root of 20304331 is about 272.8116390877.

Adding to 20304331 its reverse (13340302), we get a palindrome (33644633).

The spelling of 20304331 in words is "twenty million, three hundred four thousand, three hundred thirty-one".