20304023261 has 2 divisors, whose sum is σ = 20304023262. Its totient is φ = 20304023260.

The previous prime is 20304023227. The next prime is 20304023269. The reversal of 20304023261 is 16232040302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13370296900 + 6933726361 = 115630^2 + 83269^2 .

It is a cyclic number.

It is not a de Polignac number, because 20304023261 - 2⁶ = 20304023197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20304023269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152011630 + 10152011631.

It is an arithmetic number, because the mean of its divisors is an integer number (10152011631).

Almost surely, 2^20304023261 is an apocalyptic number.

It is an amenable number.

20304023261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304023261 is an equidigital number, since it uses as much as digits as its factorization.

20304023261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20304023261 its reverse (16232040302), we get a palindrome (36536063563).

The spelling of 20304023261 in words is "twenty billion, three hundred four million, twenty-three thousand, two hundred sixty-one".