20311212312 has 48 divisors (see below), whose sum is σ = 55554202080. Its totient is φ = 6703368000.

The previous prime is 20311212269. The next prime is 20311212319. The reversal of 20311212312 is 21321211302.

20311212312 is a `hidden beast` number, since 20 + 311 + 21 + 2 + 312 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311212319) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1389264 + ... + 1403807.

It is an arithmetic number, because the mean of its divisors is an integer number (1157379210).

Almost surely, 2^20311212312 is an apocalyptic number.

It is an amenable number.

20311212312 is an abundant number, since it is smaller than the sum of its proper divisors (35242989768).

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

20311212312 is a wasteful number, since it uses less digits than its factorization.

20311212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793184 (or 2793177 counting only the distinct ones).

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

Adding to 20311212312 its reverse (21321211302), we get a palindrome (41632423614).

The spelling of 20311212312 in words is "twenty billion, three hundred eleven million, two hundred twelve thousand, three hundred twelve".