20028856 has 24 divisors (see below), whose sum is σ = 39897720. Its totient is φ = 9424256.

The previous prime is 20028829. The next prime is 20028863. The reversal of 20028856 is 65882002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2020 + ... + 6643.

It is an arithmetic number, because the mean of its divisors is an integer number (1662405).

Almost surely, 2^20028856 is an apocalyptic number.

It is an amenable number.

20028856 is a deficient number, since it is larger than the sum of its proper divisors (19868864).

20028856 is a wasteful number, since it uses less digits than its factorization.

20028856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8703 (or 8682 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20028856 is about 4475.3609910263. The cubic root of 20028856 is about 271.5722443174.

The spelling of 20028856 in words is "twenty million, twenty-eight thousand, eight hundred fifty-six".