20085985 has 8 divisors (see below), whose sum is σ = 24880896. Its totient is φ = 15550320.

The previous prime is 20085979. The next prime is 20086007. The reversal of 20085985 is 58958002.

It is a happy number.

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

It is not a de Polignac number, because 20085985 - 2⁵ = 20085953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64639 + ... + 64948.

It is an arithmetic number, because the mean of its divisors is an integer number (3110112).

Almost surely, 2^20085985 is an apocalyptic number.

It is an amenable number.

20085985 is a deficient number, since it is larger than the sum of its proper divisors (4794911).

20085985 is a wasteful number, since it uses less digits than its factorization.

20085985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129623.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 20085985 is about 4481.7390597847. The cubic root of 20085985 is about 271.8302041843.

The spelling of 20085985 in words is "twenty million, eighty-five thousand, nine hundred eighty-five".