20111320311 has 16 divisors (see below), whose sum is σ = 27082248960. Its totient is φ = 13274035200.

The previous prime is 20111320309. The next prime is 20111320319. The reversal of 20111320311 is 11302311102.

It is a happy number.

It is not a de Polignac number, because 20111320311 - 2¹ = 20111320309 is a prime.

It is a super-2 number, since 2×20111320311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111320319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2089911 + ... + 2099511.

It is an arithmetic number, because the mean of its divisors is an integer number (1692640560).

Almost surely, 2^20111320311 is an apocalyptic number.

20111320311 is a deficient number, since it is larger than the sum of its proper divisors (6970928649).

20111320311 is a wasteful number, since it uses less digits than its factorization.

20111320311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16486.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20111320311 its reverse (11302311102), we get a palindrome (31413631413).

The spelling of 20111320311 in words is "twenty billion, one hundred eleven million, three hundred twenty thousand, three hundred eleven".