20806885 has 16 divisors (see below), whose sum is σ = 27905472. Its totient is φ = 14761600.

The previous prime is 20806871. The next prime is 20806897. The reversal of 20806885 is 58860802.

It is not a de Polignac number, because 20806885 - 2¹¹ = 20804837 is a prime.

It is a Duffinian number.

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, 2359 + ... + 6868.

It is an arithmetic number, because the mean of its divisors is an integer number (1744092).

Almost surely, 2^20806885 is an apocalyptic number.

It is an amenable number.

20806885 is a deficient number, since it is larger than the sum of its proper divisors (7098587).

20806885 is a wasteful number, since it uses less digits than its factorization.

20806885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9284.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 20806885 is about 4561.4564560017. The cubic root of 20806885 is about 275.0441141352.

The spelling of 20806885 in words is "twenty million, eight hundred six thousand, eight hundred eighty-five".