20644375047888 has 80 divisors (see below), whose sum is σ = 56139669132800. Its totient is φ = 6519107214720.

The previous prime is 20644375047887. The next prime is 20644375047977. The reversal of 20644375047888 is 88874057344602.

It is a super-2 number, since 2×20644375047888² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644375047887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37555983 + ... + 38101713.

It is an arithmetic number, because the mean of its divisors is an integer number (701745864160).

Almost surely, 2^{20644375047888} is an apocalyptic number.

It is an amenable number.

20644375047888 is an abundant number, since it is smaller than the sum of its proper divisors (35495294084912).

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

20644375047888 is a wasteful number, since it uses less digits than its factorization.

20644375047888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587240 (or 587234 counting only the distinct ones).

The product of its (nonzero) digits is 289013760, while the sum is 66.

The spelling of 20644375047888 in words is "twenty trillion, six hundred forty-four billion, three hundred seventy-five million, forty-seven thousand, eight hundred eighty-eight".