20304231 has 8 divisors (see below), whose sum is σ = 27804144. Its totient is φ = 13170240.

The previous prime is 20304227. The next prime is 20304253. The reversal of 20304231 is 13240302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20304231 - 2² = 20304227 is a prime.

It is a super-2 number, since 2×20304231² = 824523593002722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20304231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91350 + ... + 91571.

It is an arithmetic number, because the mean of its divisors is an integer number (3475518).

Almost surely, 2^20304231 is an apocalyptic number.

20304231 is a deficient number, since it is larger than the sum of its proper divisors (7499913).

20304231 is a wasteful number, since it uses less digits than its factorization.

20304231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182961.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20304231 is about 4506.0216377643. The cubic root of 20304231 is about 272.8111912159.

Adding to 20304231 its reverse (13240302), we get a palindrome (33544533).

The spelling of 20304231 in words is "twenty million, three hundred four thousand, two hundred thirty-one".