20864624896 has 72 divisors (see below), whose sum is σ = 44474169600. Its totient is φ = 9747548160.

The previous prime is 20864624881. The next prime is 20864624899. The reversal of 20864624896 is 69842646802.

It is not an unprimeable number, because it can be changed into a prime (20864624899) 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, 184815 + ... + 275473.

It is an arithmetic number, because the mean of its divisors is an integer number (617696800).

Almost surely, 2^20864624896 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 20864624896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22237084800).

20864624896 is an abundant number, since it is smaller than the sum of its proper divisors (23609544704).

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

20864624896 is an equidigital number, since it uses as much as digits as its factorization.

20864624896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90735 (or 90721 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 55.

The spelling of 20864624896 in words is "twenty billion, eight hundred sixty-four million, six hundred twenty-four thousand, eight hundred ninety-six".