20311020012 has 48 divisors (see below), whose sum is σ = 49093884000. Its totient is φ = 6530979840.

The previous prime is 20311019999. The next prime is 20311020031. The reversal of 20311020012 is 21002011302.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20311020012.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 188137 + ... + 275712.

It is an arithmetic number, because the mean of its divisors is an integer number (1022789250).

Almost surely, 2^20311020012 is an apocalyptic number.

It is an amenable number.

20311020012 is an abundant number, since it is smaller than the sum of its proper divisors (28782863988).

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

20311020012 is a wasteful number, since it uses less digits than its factorization.

20311020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463986 (or 463984 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20311020012 its reverse (21002011302), we get a palindrome (41313031314).

The spelling of 20311020012 in words is "twenty billion, three hundred eleven million, twenty thousand, twelve".