20311111223 has 4 divisors (see below), whose sum is σ = 21873504408. Its totient is φ = 18748718040.

The previous prime is 20311111217. The next prime is 20311111243. The reversal of 20311111223 is 32211111302.

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

It is not a de Polignac number, because 20311111223 - 2¹⁶ = 20311045687 is a prime.

It is a super-2 number, since 2×20311111223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311111243) 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, 781196573 + ... + 781196598.

It is an arithmetic number, because the mean of its divisors is an integer number (5468376102).

Almost surely, 2^20311111223 is an apocalyptic number.

20311111223 is a deficient number, since it is larger than the sum of its proper divisors (1562393185).

20311111223 is a wasteful number, since it uses less digits than its factorization.

20311111223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562393184.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20311111223 its reverse (32211111302), we get a palindrome (52522222525).

The spelling of 20311111223 in words is "twenty billion, three hundred eleven million, one hundred eleven thousand, two hundred twenty-three".