20009085 has 16 divisors (see below), whose sum is σ = 33898176. Its totient is φ = 10043648.

The previous prime is 20009053. The next prime is 20009113. The reversal of 20009085 is 58090002.

It is a cyclic number.

It is not a de Polignac number, because 20009085 - 2⁵ = 20009053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38979 + ... + 39488.

It is an arithmetic number, because the mean of its divisors is an integer number (2118636).

Almost surely, 2^20009085 is an apocalyptic number.

It is an amenable number.

20009085 is a deficient number, since it is larger than the sum of its proper divisors (13889091).

20009085 is a wasteful number, since it uses less digits than its factorization.

20009085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78492.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20009085 is about 4473.1515735553. The cubic root of 20009085 is about 271.4828562445.

Adding to 20009085 its reverse (58090002), we get a palindrome (78099087).

The spelling of 20009085 in words is "twenty million, nine thousand, eighty-five".