20355165 has 16 divisors (see below), whose sum is σ = 36187200. Its totient is φ = 10856016.

The previous prime is 20355157. The next prime is 20355191. The reversal of 20355165 is 56155302.

It is not a de Polignac number, because 20355165 - 2³ = 20355157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 15 ways as a sum of consecutive naturals, for example, 75255 + ... + 75524.

It is an arithmetic number, because the mean of its divisors is an integer number (2261700).

Almost surely, 2^20355165 is an apocalyptic number.

It is an amenable number.

20355165 is a deficient number, since it is larger than the sum of its proper divisors (15832035).

20355165 is a wasteful number, since it uses less digits than its factorization.

20355165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150793 (or 150787 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 20355165 is about 4511.6698682417. The cubic root of 20355165 is about 273.0391201034.

The spelling of 20355165 in words is "twenty million, three hundred fifty-five thousand, one hundred sixty-five".