20806085 has 8 divisors (see below), whose sum is σ = 24999576. Its totient is φ = 16623360.

The previous prime is 20806081. The next prime is 20806091. The reversal of 20806085 is 58060802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3364 + 20802721 = 58^2 + 4561^2 .

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

It is not a de Polignac number, because 20806085 - 2² = 20806081 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2465 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (3124947).

Almost surely, 2^20806085 is an apocalyptic number.

It is an amenable number.

20806085 is a deficient number, since it is larger than the sum of its proper divisors (4193491).

20806085 is an equidigital number, since it uses as much as digits as its factorization.

20806085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5383.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20806085 is about 4561.3687638690. The cubic root of 20806085 is about 275.0405890502.

Adding to 20806085 its reverse (58060802), we get a palindrome (78866887).

The spelling of 20806085 in words is "twenty million, eight hundred six thousand, eighty-five".