20289165 has 16 divisors (see below), whose sum is σ = 34960128. Its totient is φ = 9988416.

The previous prime is 20289103. The next prime is 20289167. The reversal of 20289165 is 56198202.

It is not a de Polignac number, because 20289165 - 2⁸ = 20288909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289167) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 51829 + ... + 52218.

It is an arithmetic number, because the mean of its divisors is an integer number (2185008).

Almost surely, 2^20289165 is an apocalyptic number.

It is an amenable number.

20289165 is a deficient number, since it is larger than the sum of its proper divisors (14670963).

20289165 is a wasteful number, since it uses less digits than its factorization.

20289165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104068.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20289165 is about 4504.3495645875. The cubic root of 20289165 is about 272.7436980511.

The spelling of 20289165 in words is "twenty million, two hundred eighty-nine thousand, one hundred sixty-five".