20256585 has 16 divisors (see below), whose sum is σ = 32478144. Its totient is φ = 10780992.

The previous prime is 20256581. The next prime is 20256589. The reversal of 20256585 is 58565202.

It is an interprime number because it is at equal distance from previous prime (20256581) and next prime (20256589).

It is not a de Polignac number, because 20256585 - 2² = 20256581 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20256581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8094 + ... + 10296.

It is an arithmetic number, because the mean of its divisors is an integer number (2029884).

Almost surely, 2^20256585 is an apocalyptic number.

It is an amenable number.

20256585 is a deficient number, since it is larger than the sum of its proper divisors (12221559).

20256585 is a wasteful number, since it uses less digits than its factorization.

20256585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824.

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 20256585 is about 4500.7316071945. The cubic root of 20256585 is about 272.5976307577.

The spelling of 20256585 in words is "twenty million, two hundred fifty-six thousand, five hundred eighty-five".