20814856 has 8 divisors (see below), whose sum is σ = 39027870. Its totient is φ = 10407424.

The previous prime is 20814811. The next prime is 20814863. The reversal of 20814856 is 65841802.

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 3724900 = 4134^2 + 1930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1300921 + ... + 1300936.

Almost surely, 2^20814856 is an apocalyptic number.

It is an amenable number.

20814856 is a deficient number, since it is larger than the sum of its proper divisors (18213014).

20814856 is a wasteful number, since it uses less digits than its factorization.

20814856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601863 (or 2601859 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20814856 is about 4562.3301064259. The cubic root of 20814856 is about 275.0792322660.

The spelling of 20814856 in words is "twenty million, eight hundred fourteen thousand, eight hundred fifty-six".