20111311311 has 64 divisors (see below), whose sum is σ = 34787450880. Its totient is φ = 10036172160.

The previous prime is 20111311309. The next prime is 20111311313. The reversal of 20111311311 is 11311311102.

It is an interprime number because it is at equal distance from previous prime (20111311309) and next prime (20111311313).

It is not a de Polignac number, because 20111311311 - 2¹ = 20111311309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111311313) 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 in 63 ways as a sum of consecutive naturals, for example, 4577926 + ... + 4582316.

It is an arithmetic number, because the mean of its divisors is an integer number (543553920).

Almost surely, 2^20111311311 is an apocalyptic number.

20111311311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20111311311 is a deficient number, since it is larger than the sum of its proper divisors (14676139569).

20111311311 is a wasteful number, since it uses less digits than its factorization.

20111311311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 20111311311 its reverse (11311311102), we get a palindrome (31422622413).

The spelling of 20111311311 in words is "twenty billion, one hundred eleven million, three hundred eleven thousand, three hundred eleven".