20028855 has 32 divisors (see below), whose sum is σ = 39955968. Its totient is φ = 8323200.

The previous prime is 20028829. The next prime is 20028863. The reversal of 20028855 is 55882002.

It is not a de Polignac number, because 20028855 - 2⁵ = 20028823 is a prime.

It is a super-2 number, since 2×20028855² = 802310065222050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7516 + ... + 9825.

It is an arithmetic number, because the mean of its divisors is an integer number (1248624).

Almost surely, 2^20028855 is an apocalyptic number.

20028855 is a deficient number, since it is larger than the sum of its proper divisors (19927113).

20028855 is a wasteful number, since it uses less digits than its factorization.

20028855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17367.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 20028855 is about 4475.3608793035. The cubic root of 20028855 is about 271.5722397977.

The spelling of 20028855 in words is "twenty million, twenty-eight thousand, eight hundred fifty-five".