20605265113 has 2 divisors, whose sum is σ = 20605265114. Its totient is φ = 20605265112.

The previous prime is 20605265099. The next prime is 20605265119. The reversal of 20605265113 is 31156250602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20578763209 + 26501904 = 143453^2 + 5148^2 .

It is a cyclic number.

It is not a de Polignac number, because 20605265113 - 2⁹ = 20605264601 is a prime.

It is not a weakly prime, because it can be changed into another prime (20605265119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302632556 + 10302632557.

It is an arithmetic number, because the mean of its divisors is an integer number (10302632557).

Almost surely, 2^20605265113 is an apocalyptic number.

It is an amenable number.

20605265113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20605265113 is an equidigital number, since it uses as much as digits as its factorization.

20605265113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 20605265113 in words is "twenty billion, six hundred five million, two hundred sixty-five thousand, one hundred thirteen".