20804856 has 16 divisors (see below), whose sum is σ = 52012200. Its totient is φ = 6934944.

The previous prime is 20804837. The next prime is 20804869. The reversal of 20804856 is 65840802.

It is a congruent number.

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, 433411 + ... + 433458.

Almost surely, 2^20804856 is an apocalyptic number.

It is an amenable number.

20804856 is an abundant number, since it is smaller than the sum of its proper divisors (31207344).

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

20804856 is a wasteful number, since it uses less digits than its factorization.

20804856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866878 (or 866874 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 20804856 is about 4561.2340435457. The cubic root of 20804856 is about 275.0351734624.

The spelling of 20804856 in words is "twenty million, eight hundred four thousand, eight hundred fifty-six".