20844521475744 has 96 divisors (see below), whose sum is σ = 55540242487296. Its totient is φ = 6843643488000.

The previous prime is 20844521475733. The next prime is 20844521475781. The reversal of 20844521475744 is 44757412544802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54268369 + ... + 54651119.

It is an arithmetic number, because the mean of its divisors is an integer number (578544192576).

Almost surely, 2^{20844521475744} is an apocalyptic number.

20844521475744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20844521475744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27770121243648).

20844521475744 is an abundant number, since it is smaller than the sum of its proper divisors (34695721011552).

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

20844521475744 is a wasteful number, since it uses less digits than its factorization.

20844521475744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391298 (or 391290 counting only the distinct ones).

The product of its (nonzero) digits is 40140800, while the sum is 57.

The spelling of 20844521475744 in words is "twenty trillion, eight hundred forty-four billion, five hundred twenty-one million, four hundred seventy-five thousand, seven hundred forty-four".