20845264896 has 128 divisors (see below), whose sum is σ = 61765426800. Its totient is φ = 6948126720.

The previous prime is 20845264859. The next prime is 20845264897. The reversal of 20845264896 is 69846254802.

20845264896 is a `hidden beast` number, since 20 + 8 + 4 + 526 + 4 + 8 + 96 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20845264897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 872956 + ... + 896516.

Almost surely, 2^20845264896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20845264896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30882713400).

20845264896 is an abundant number, since it is smaller than the sum of its proper divisors (40920161904).

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

20845264896 is an frugal number, since it uses more digits than its factorization.

20845264896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23600 (or 23566 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 20845264896 in words is "twenty billion, eight hundred forty-five million, two hundred sixty-four thousand, eight hundred ninety-six".