20845856 has 24 divisors (see below), whose sum is σ = 41147820. Its totient is φ = 10395648.

The previous prime is 20845849. The next prime is 20845871. The reversal of 20845856 is 65854802.

It can be written as a sum of positive squares in 2 ways, for example, as 20611600 + 234256 = 4540^2 + 484^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17900 + ... + 19028.

Almost surely, 2^20845856 is an apocalyptic number.

It is an amenable number.

20845856 is a deficient number, since it is larger than the sum of its proper divisors (20301964).

20845856 is a wasteful number, since it uses less digits than its factorization.

20845856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716 (or 1708 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 20845856 is about 4565.7262291995. The cubic root of 20845856 is about 275.2157249443.

It can be divided in two parts, 208 and 45856, that added together give a palindrome (46064).

The spelling of 20845856 in words is "twenty million, eight hundred forty-five thousand, eight hundred fifty-six".