20849685 has 16 divisors (see below), whose sum is σ = 34262016. Its totient is φ = 10819008.

The previous prime is 20849681. The next prime is 20849713. The reversal of 20849685 is 58694802.

It is not a de Polignac number, because 20849685 - 2² = 20849681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18229 + ... + 19338.

It is an arithmetic number, because the mean of its divisors is an integer number (2141376).

Almost surely, 2^20849685 is an apocalyptic number.

It is an amenable number.

20849685 is a deficient number, since it is larger than the sum of its proper divisors (13412331).

20849685 is a wasteful number, since it uses less digits than its factorization.

20849685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37612.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20849685 is about 4566.1455298753. The cubic root of 20849685 is about 275.2325746001.

The spelling of 20849685 in words is "twenty million, eight hundred forty-nine thousand, six hundred eighty-five".