20311200312 has 64 divisors (see below), whose sum is σ = 54697954080. Its totient is φ = 6248005632.

The previous prime is 20311200311. The next prime is 20311200323. The reversal of 20311200312 is 21300211302.

It is a super-2 number, since 2×20311200312² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20311200291 and 20311200300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311200311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1972008 + ... + 1982280.

Almost surely, 2^20311200312 is an apocalyptic number.

It is an amenable number.

20311200312 is an abundant number, since it is smaller than the sum of its proper divisors (34386753768).

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

20311200312 is a wasteful number, since it uses less digits than its factorization.

20311200312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16632 (or 16628 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20311200312 its reverse (21300211302), we get a palindrome (41611411614).

The spelling of 20311200312 in words is "twenty billion, three hundred eleven million, two hundred thousand, three hundred twelve".