20676611209 has 2 divisors, whose sum is σ = 20676611210. Its totient is φ = 20676611208.

The previous prime is 20676611171. The next prime is 20676611239. The reversal of 20676611209 is 90211667602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17401567225 + 3275043984 = 131915^2 + 57228^2 .

It is a cyclic number.

It is not a de Polignac number, because 20676611209 - 2⁹ = 20676610697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20676611239) 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, 10338305604 + 10338305605.

It is an arithmetic number, because the mean of its divisors is an integer number (10338305605).

Almost surely, 2^20676611209 is an apocalyptic number.

It is an amenable number.

20676611209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20676611209 is an equidigital number, since it uses as much as digits as its factorization.

20676611209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 20676611209 in words is "twenty billion, six hundred seventy-six million, six hundred eleven thousand, two hundred nine".