20001838868872 has 16 divisors (see below), whose sum is σ = 42861083290560. Its totient is φ = 8572216658064.

The previous prime is 20001838868833. The next prime is 20001838868873. The reversal of 20001838868872 is 27886883810002.

It is a self number, because there is not a number n which added to its sum of digits gives 20001838868872.

It is not an unprimeable number, because it can be changed into a prime (20001838868873) 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 3 ways as a sum of consecutive naturals, for example, 178587846988 + ... + 178587847099.

It is an arithmetic number, because the mean of its divisors is an integer number (2678817705660).

Almost surely, 2^{20001838868872} is an apocalyptic number.

It is an amenable number.

20001838868872 is an abundant number, since it is smaller than the sum of its proper divisors (22859244421688).

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

20001838868872 is a wasteful number, since it uses less digits than its factorization.

20001838868872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357175694100 (or 357175694096 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 61.

The spelling of 20001838868872 in words is "twenty trillion, one billion, eight hundred thirty-eight million, eight hundred sixty-eight thousand, eight hundred seventy-two".