20304013 has 2 divisors, whose sum is σ = 20304014. Its totient is φ = 20304012.

The previous prime is 20304007. The next prime is 20304023. The reversal of 20304013 is 31040302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20187049 + 116964 = 4493^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 20304013 - 2⁵ = 20303981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20303984 and 20304002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20304023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152006 + 10152007.

It is an arithmetic number, because the mean of its divisors is an integer number (10152007).

Almost surely, 2^20304013 is an apocalyptic number.

It is an amenable number.

20304013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304013 is an equidigital number, since it uses as much as digits as its factorization.

20304013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20304013 is about 4505.9974478466. The cubic root of 20304013 is about 272.8102148504.

Adding to 20304013 its reverse (31040302), we get a palindrome (51344315).

The spelling of 20304013 in words is "twenty million, three hundred four thousand, thirteen".