20111303311 has 4 divisors (see below), whose sum is σ = 21939603624. Its totient is φ = 18283003000.

The previous prime is 20111303209. The next prime is 20111303323. The reversal of 20111303311 is 11330311102.

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-20111303311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111303371) 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, 914150140 + ... + 914150161.

It is an arithmetic number, because the mean of its divisors is an integer number (5484900906).

Almost surely, 2^20111303311 is an apocalyptic number.

20111303311 is a deficient number, since it is larger than the sum of its proper divisors (1828300313).

20111303311 is a wasteful number, since it uses less digits than its factorization.

20111303311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828300312.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 20111303311 its reverse (11330311102), we get a palindrome (31441614413).

The spelling of 20111303311 in words is "twenty billion, one hundred eleven million, three hundred three thousand, three hundred eleven".