20844644808 has 64 divisors (see below), whose sum is σ = 56134008000. Its totient is φ = 6412158720.

The previous prime is 20844644801. The next prime is 20844644819. The reversal of 20844644808 is 80844644802.

It is not an unprimeable number, because it can be changed into a prime (20844644801) 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, 2288343 + ... + 2297433.

It is an arithmetic number, because the mean of its divisors is an integer number (877093875).

Almost surely, 2^20844644808 is an apocalyptic number.

It is an amenable number.

20844644808 is an abundant number, since it is smaller than the sum of its proper divisors (35289363192).

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

20844644808 is a wasteful number, since it uses less digits than its factorization.

20844644808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16462 (or 16458 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 48.

The spelling of 20844644808 in words is "twenty billion, eight hundred forty-four million, six hundred forty-four thousand, eight hundred eight".