20320885 has 16 divisors (see below), whose sum is σ = 26409600. Its totient is φ = 14921280.

The previous prime is 20320877. The next prime is 20320907. The reversal of 20320885 is 58802302.

It is not a de Polignac number, because 20320885 - 2³ = 20320877 is a prime.

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, 12150 + ... + 13720.

It is an arithmetic number, because the mean of its divisors is an integer number (1650600).

Almost surely, 2^20320885 is an apocalyptic number.

It is an amenable number.

20320885 is a deficient number, since it is larger than the sum of its proper divisors (6088715).

20320885 is a wasteful number, since it uses less digits than its factorization.

20320885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20320885 is about 4507.8692305789. The cubic root of 20320885 is about 272.8857595156.

The spelling of 20320885 in words is "twenty million, three hundred twenty thousand, eight hundred eighty-five".