20010111311 has 4 divisors (see below), whose sum is σ = 20349265800. Its totient is φ = 19670956824.

The previous prime is 20010111299. The next prime is 20010111379. The reversal of 20010111311 is 11311101002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010111311 is a prime.

It is a super-2 number, since 2×20010111311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010111292 and 20010111301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010111391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169577156 + ... + 169577273.

It is an arithmetic number, because the mean of its divisors is an integer number (5087316450).

Almost surely, 2^20010111311 is an apocalyptic number.

20010111311 is a deficient number, since it is larger than the sum of its proper divisors (339154489).

20010111311 is an equidigital number, since it uses as much as digits as its factorization.

20010111311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339154488.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 20010111311 its reverse (11311101002), we get a palindrome (31321212313).

The spelling of 20010111311 in words is "twenty billion, ten million, one hundred eleven thousand, three hundred eleven".