20311223111 has 8 divisors (see below), whose sum is σ = 21349026144. Its totient is φ = 19286312320.

The previous prime is 20311223077. The next prime is 20311223147. The reversal of 20311223111 is 11132211302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311223111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20311223111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311223171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3219830 + ... + 3226131.

It is an arithmetic number, because the mean of its divisors is an integer number (2668628268).

Almost surely, 2^20311223111 is an apocalyptic number.

20311223111 is a deficient number, since it is larger than the sum of its proper divisors (1037803033).

20311223111 is a wasteful number, since it uses less digits than its factorization.

20311223111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6446121.

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

Adding to 20311223111 its reverse (11132211302), we get a palindrome (31443434413).

The spelling of 20311223111 in words is "twenty billion, three hundred eleven million, two hundred twenty-three thousand, one hundred eleven".