20311211312 has 120 divisors (see below), whose sum is σ = 49855070976. Its totient is φ = 7836263424.

The previous prime is 20311211311. The next prime is 20311211387. The reversal of 20311211312 is 21311211302.

It is a super-2 number, since 2×20311211312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (20311211311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 730823 + ... + 758105.

Almost surely, 2^20311211312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20311211312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24927535488).

20311211312 is an abundant number, since it is smaller than the sum of its proper divisors (29543859664).

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

20311211312 is a wasteful number, since it uses less digits than its factorization.

20311211312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27355 (or 27332 counting only the distinct ones).

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

Adding to 20311211312 its reverse (21311211302), we get a palindrome (41622422614).

The spelling of 20311211312 in words is "twenty billion, three hundred eleven million, two hundred eleven thousand, three hundred twelve".