20304311 has 2 divisors, whose sum is σ = 20304312. Its totient is φ = 20304310.

The previous prime is 20304289. The next prime is 20304313. The reversal of 20304311 is 11340302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20304311 is a prime.

Together with 20304313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20304313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152155 + 10152156.

It is an arithmetic number, because the mean of its divisors is an integer number (10152156).

Almost surely, 2^20304311 is an apocalyptic number.

20304311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304311 is an equidigital number, since it uses as much as digits as its factorization.

20304311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20304311 is about 4506.0305147657. The cubic root of 20304311 is about 272.8115495135.

Adding to 20304311 its reverse (11340302), we get a palindrome (31644613).

The spelling of 20304311 in words is "twenty million, three hundred four thousand, three hundred eleven".