20863904256 has 480 divisors, whose sum is σ = 71316685440. Its totient is φ = 5810061312.

The previous prime is 20863904251. The next prime is 20863904387. The reversal of 20863904256 is 65240936802.

20863904256 is a `hidden beast` number, since 2 + 0 + 8 + 6 + 390 + 4 + 256 = 666.

It is not an unprimeable number, because it can be changed into a prime (20863904251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26177650 + ... + 26178446.

It is an arithmetic number, because the mean of its divisors is an integer number (148576428).

Almost surely, 2^20863904256 is an apocalyptic number.

20863904256 is a gapful number since it is divisible by the number (26) 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 20863904256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35658342720).

20863904256 is an abundant number, since it is smaller than the sum of its proper divisors (50452781184).

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

20863904256 is a wasteful number, since it uses less digits than its factorization.

20863904256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 20863904256 in words is "twenty billion, eight hundred sixty-three million, nine hundred four thousand, two hundred fifty-six".