20384805 has 16 divisors (see below), whose sum is σ = 37275264. Its totient is φ = 9318720.

The previous prime is 20384789. The next prime is 20384809. The reversal of 20384805 is 50848302.

It is not a de Polignac number, because 20384805 - 2⁴ = 20384789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20384809) 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, 96966 + ... + 97175.

It is an arithmetic number, because the mean of its divisors is an integer number (2329704).

Almost surely, 2^20384805 is an apocalyptic number.

It is an amenable number.

20384805 is a deficient number, since it is larger than the sum of its proper divisors (16890459).

20384805 is a wasteful number, since it uses less digits than its factorization.

20384805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194156.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20384805 is about 4514.9534881325. The cubic root of 20384805 is about 273.1715836914.

The spelling of 20384805 in words is "twenty million, three hundred eighty-four thousand, eight hundred five".