20004305 has 4 divisors (see below), whose sum is σ = 24005172. Its totient is φ = 16003440.

The previous prime is 20004289. The next prime is 20004307. The reversal of 20004305 is 50340002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2972176 + 17032129 = 1724^2 + 4127^2 .

It is not a de Polignac number, because 20004305 - 2⁴ = 20004289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20004305.

It is not an unprimeable number, because it can be changed into a prime (20004307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000426 + ... + 2000435.

It is an arithmetic number, because the mean of its divisors is an integer number (6001293).

Almost surely, 2^20004305 is an apocalyptic number.

It is an amenable number.

20004305 is a deficient number, since it is larger than the sum of its proper divisors (4000867).

20004305 is an equidigital number, since it uses as much as digits as its factorization.

20004305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000866.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20004305 is about 4472.6172427338. The cubic root of 20004305 is about 271.4612362087.

Adding to 20004305 its reverse (50340002), we get a palindrome (70344307).

The spelling of 20004305 in words is "twenty million, four thousand, three hundred five".