20855809056 has 96 divisors (see below), whose sum is σ = 55079474688. Its totient is φ = 6909788160.

The previous prime is 20855809033. The next prime is 20855809103. The reversal of 20855809056 is 65090855802.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×20855809056² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 20855808996 and 20855809014.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21044721 + ... + 21045711.

It is an arithmetic number, because the mean of its divisors is an integer number (573744528).

Almost surely, 2^20855809056 is an apocalyptic number.

It is an amenable number.

20855809056 is an abundant number, since it is smaller than the sum of its proper divisors (34223665632).

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

20855809056 is a wasteful number, since it uses less digits than its factorization.

20855809056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 2106 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 48.

The spelling of 20855809056 in words is "twenty billion, eight hundred fifty-five million, eight hundred nine thousand, fifty-six".