20885685 has 8 divisors (see below), whose sum is σ = 33417120. Its totient is φ = 11139024.

The previous prime is 20885663. The next prime is 20885701. The reversal of 20885685 is 58658802.

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

It is not a de Polignac number, because 20885685 - 2⁶ = 20885621 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696175 + ... + 696204.

It is an arithmetic number, because the mean of its divisors is an integer number (4177140).

Almost surely, 2^20885685 is an apocalyptic number.

It is an amenable number.

20885685 is a deficient number, since it is larger than the sum of its proper divisors (12531435).

20885685 is a wasteful number, since it uses less digits than its factorization.

20885685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392387.

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 20885685 is about 4570.0858854074. The cubic root of 20885685 is about 275.3908931455.

The spelling of 20885685 in words is "twenty million, eight hundred eighty-five thousand, six hundred eighty-five".