20563230856 has 64 divisors (see below), whose sum is σ = 45287383680. Its totient is φ = 8569566720.

The previous prime is 20563230847. The next prime is 20563230859. The reversal of 20563230856 is 65803236502.

It is not an unprimeable number, because it can be changed into a prime (20563230859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690286 + ... + 719458.

It is an arithmetic number, because the mean of its divisors is an integer number (707615370).

Almost surely, 2^20563230856 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 20563230856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22643691840).

20563230856 is an abundant number, since it is smaller than the sum of its proper divisors (24724152824).

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

20563230856 is a wasteful number, since it uses less digits than its factorization.

20563230856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29534 (or 29530 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 20563230856 in words is "twenty billion, five hundred sixty-three million, two hundred thirty thousand, eight hundred fifty-six".