20806585 has 8 divisors (see below), whose sum is σ = 25099776. Its totient is φ = 16557360.

The previous prime is 20806573. The next prime is 20806613. The reversal of 20806585 is 58560802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20806585 - 2⁵ = 20806553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20806585.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9939 + ... + 11848.

It is an arithmetic number, because the mean of its divisors is an integer number (3137472).

Almost surely, 2^20806585 is an apocalyptic number.

It is an amenable number.

20806585 is a deficient number, since it is larger than the sum of its proper divisors (4293191).

20806585 is a wasteful number, since it uses less digits than its factorization.

20806585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21983.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 20806585 is about 4561.4235716495. The cubic root of 20806585 is about 275.0427922389.

The spelling of 20806585 in words is "twenty million, eight hundred six thousand, five hundred eighty-five".