20085689 has 8 divisors (see below), whose sum is σ = 21690312. Its totient is φ = 18489600.

The previous prime is 20085643. The next prime is 20085697. The reversal of 20085689 is 98658002.

It can be written as a sum of positive squares in 4 ways, for example, as 12020089 + 8065600 = 3467^2 + 2840^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20085689 - 2²⁰ = 19037113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20085629) 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, 3287 + ... + 7139.

It is an arithmetic number, because the mean of its divisors is an integer number (2711289).

Almost surely, 2^20085689 is an apocalyptic number.

It is an amenable number.

20085689 is a deficient number, since it is larger than the sum of its proper divisors (1604623).

20085689 is a wasteful number, since it uses less digits than its factorization.

20085689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 20085689 is about 4481.7060367677. The cubic root of 20085689 is about 271.8288688895.

The spelling of 20085689 in words is "twenty million, eighty-five thousand, six hundred eighty-nine".