20042985 has 16 divisors (see below), whose sum is σ = 32284800. Its totient is φ = 10617600.

The previous prime is 20042951. The next prime is 20042993. The reversal of 20042985 is 58924002.

It is not a de Polignac number, because 20042985 - 2¹⁵ = 20010217 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 2160 + ... + 6689.

It is an arithmetic number, because the mean of its divisors is an integer number (2017800).

Almost surely, 2^20042985 is an apocalyptic number.

It is an amenable number.

20042985 is a deficient number, since it is larger than the sum of its proper divisors (12241815).

20042985 is a wasteful number, since it uses less digits than its factorization.

20042985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9008.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20042985 is about 4476.9392446179. The cubic root of 20042985 is about 271.6360879094.

Adding to 20042985 its reverse (58924002), we get a palindrome (78966987).

The spelling of 20042985 in words is "twenty million, forty-two thousand, nine hundred eighty-five".