20304313 has 2 divisors, whose sum is σ = 20304314. Its totient is φ = 20304312.

The previous prime is 20304311. The next prime is 20304413. The reversal of 20304313 is 31340302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13191424 + 7112889 = 3632^2 + 2667^2 .

It is a cyclic number.

It is not a de Polignac number, because 20304313 - 2¹ = 20304311 is a prime.

Together with 20304311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20304311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152156 + 10152157.

It is an arithmetic number, because the mean of its divisors is an integer number (10152157).

Almost surely, 2^20304313 is an apocalyptic number.

It is an amenable number.

20304313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304313 is an equidigital number, since it uses as much as digits as its factorization.

20304313 is an evil number, because the sum of its binary digits is even.

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

The square root of 20304313 is about 4506.0307366906. The cubic root of 20304313 is about 272.8115584709.

Adding to 20304313 its reverse (31340302), we get a palindrome (51644615).

The spelling of 20304313 in words is "twenty million, three hundred four thousand, three hundred thirteen".