20304159 has 4 divisors (see below), whose sum is σ = 27072216. Its totient is φ = 13536104.

The previous prime is 20304139. The next prime is 20304161. The reversal of 20304159 is 95140302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20304159 - 2⁸ = 20303903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3384024 + ... + 3384029.

It is an arithmetic number, because the mean of its divisors is an integer number (6768054).

Almost surely, 2^20304159 is an apocalyptic number.

20304159 is a deficient number, since it is larger than the sum of its proper divisors (6768057).

20304159 is an equidigital number, since it uses as much as digits as its factorization.

20304159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6768056.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20304159 is about 4506.0136484480. The cubic root of 20304159 is about 272.8108687474.

The spelling of 20304159 in words is "twenty million, three hundred four thousand, one hundred fifty-nine".