20585145 has 32 divisors (see below), whose sum is σ = 38419200. Its totient is φ = 9408000.

The previous prime is 20585129. The next prime is 20585167. The reversal of 20585145 is 54158502.

It is not a de Polignac number, because 20585145 - 2⁴ = 20585129 is a prime.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 3145 + ... + 7145.

It is an arithmetic number, because the mean of its divisors is an integer number (1200600).

Almost surely, 2^20585145 is an apocalyptic number.

It is an amenable number.

20585145 is a deficient number, since it is larger than the sum of its proper divisors (17834055).

20585145 is an equidigital number, since it uses as much as digits as its factorization.

20585145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030 (or 4016 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 20585145 is about 4537.0855182595. The cubic root of 20585145 is about 274.0635697069.

The spelling of 20585145 in words is "twenty million, five hundred eighty-five thousand, one hundred forty-five".