20311202911 has 2 divisors, whose sum is σ = 20311202912. Its totient is φ = 20311202910.

The previous prime is 20311202909. The next prime is 20311202921. The reversal of 20311202911 is 11920211302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20311202911 - 2¹ = 20311202909 is a prime.

Together with 20311202909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311202921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155601455 + 10155601456.

It is an arithmetic number, because the mean of its divisors is an integer number (10155601456).

Almost surely, 2^20311202911 is an apocalyptic number.

20311202911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311202911 is an equidigital number, since it uses as much as digits as its factorization.

20311202911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 20311202911 in words is "twenty billion, three hundred eleven million, two hundred two thousand, nine hundred eleven".