20301023261 has 2 divisors, whose sum is σ = 20301023262. Its totient is φ = 20301023260.

The previous prime is 20301023243. The next prime is 20301023273. The reversal of 20301023261 is 16232010302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20210887225 + 90136036 = 142165^2 + 9494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20301023261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20301020261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150511630 + 10150511631.

It is an arithmetic number, because the mean of its divisors is an integer number (10150511631).

Almost surely, 2^20301023261 is an apocalyptic number.

It is an amenable number.

20301023261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20301023261 is an equidigital number, since it uses as much as digits as its factorization.

20301023261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20301023261 its reverse (16232010302), we get a palindrome (36533033563).

The spelling of 20301023261 in words is "twenty billion, three hundred one million, twenty-three thousand, two hundred sixty-one".