20311223112 has 48 divisors (see below), whose sum is σ = 56496314940. Its totient is φ = 6587422848.

The previous prime is 20311223077. The next prime is 20311223147. The reversal of 20311223112 is 21132211302.

20311223112 is a `hidden beast` number, since 20 + 311 + 22 + 311 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (20311223077) and next prime (20311223147).

It can be written as a sum of positive squares in 2 ways, for example, as 19078791876 + 1232431236 = 138126^2 + 35106^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3809503 + ... + 3814830.

Almost surely, 2^20311223112 is an apocalyptic number.

It is an amenable number.

20311223112 is an abundant number, since it is smaller than the sum of its proper divisors (36185091828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311223112 is a wasteful number, since it uses less digits than its factorization.

20311223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7624382 (or 7624375 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20311223112 its reverse (21132211302), we get a palindrome (41443434414).

The spelling of 20311223112 in words is "twenty billion, three hundred eleven million, two hundred twenty-three thousand, one hundred twelve".