20311213122 has 48 divisors (see below), whose sum is σ = 46299452472. Its totient is φ = 6426743040.

The previous prime is 20311213073. The next prime is 20311213133. The reversal of 20311213122 is 22131211302.

20311213122 is a `hidden beast` number, since 20 + 311 + 21 + 312 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10832438241 + 9478774881 = 104079^2 + 97359^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20311213095 and 20311213104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344613 + ... + 399224.

Almost surely, 2^20311213122 is an apocalyptic number.

20311213122 is an abundant number, since it is smaller than the sum of its proper divisors (25988239350).

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

20311213122 is a wasteful number, since it uses less digits than its factorization.

20311213122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743923 (or 743920 counting only the distinct ones).

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

Adding to 20311213122 its reverse (22131211302), we get a palindrome (42442424424).

The spelling of 20311213122 in words is "twenty billion, three hundred eleven million, two hundred thirteen thousand, one hundred twenty-two".