20288259 has 16 divisors (see below), whose sum is σ = 31825440. Its totient is φ = 12729600.

The previous prime is 20288251. The next prime is 20288273. The reversal of 20288259 is 95288202.

It is not a de Polignac number, because 20288259 - 2³ = 20288251 is a prime.

It is a super-2 number, since 2×20288259² = 823226906502162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20288251) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21642 + ... + 22559.

It is an arithmetic number, because the mean of its divisors is an integer number (1989090).

Almost surely, 2^20288259 is an apocalyptic number.

20288259 is a deficient number, since it is larger than the sum of its proper divisors (11537181).

20288259 is a wasteful number, since it uses less digits than its factorization.

20288259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44227 (or 44221 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20288259 is about 4504.2489940055. The cubic root of 20288259 is about 272.7396382575.

The spelling of 20288259 in words is "twenty million, two hundred eighty-eight thousand, two hundred fifty-nine".