20259855 has 64 divisors (see below), whose sum is σ = 44928000. Its totient is φ = 8415360.

The previous prime is 20259847. The next prime is 20259881. The reversal of 20259855 is 55895202.

It is not a de Polignac number, because 20259855 - 2³ = 20259847 is a prime.

It is a congruent number.

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 in 63 ways as a sum of consecutive naturals, for example, 9421 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (702000).

Almost surely, 2^20259855 is an apocalyptic number.

20259855 is an abundant number, since it is smaller than the sum of its proper divisors (24668145).

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

20259855 is a wasteful number, since it uses less digits than its factorization.

20259855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 20259855 is about 4501.0948668074. The cubic root of 20259855 is about 272.6122983549.

The spelling of 20259855 in words is "twenty million, two hundred fifty-nine thousand, eight hundred fifty-five".