20904885 has 40 divisors (see below), whose sum is σ = 38054016. Its totient is φ = 10977120.

The previous prime is 20904859. The next prime is 20904899. The reversal of 20904885 is 58840902.

It is not a de Polignac number, because 20904885 - 2¹³ = 20896693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28392 + ... + 29118.

Almost surely, 2^20904885 is an apocalyptic number.

It is an amenable number.

20904885 is a deficient number, since it is larger than the sum of its proper divisors (17149131).

20904885 is an equidigital number, since it uses as much as digits as its factorization.

20904885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 806 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20904885 is about 4572.1860198378. The cubic root of 20904885 is about 275.4752553250.

The spelling of 20904885 in words is "twenty million, nine hundred four thousand, eight hundred eighty-five".