20304305 has 16 divisors (see below), whose sum is σ = 28600320. Its totient is φ = 13545792.

The previous prime is 20304289. The next prime is 20304311. The reversal of 20304305 is 50340302.

It is a cyclic number.

It is not a de Polignac number, because 20304305 - 2⁴ = 20304289 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6545 + ... + 9134.

It is an arithmetic number, because the mean of its divisors is an integer number (1787520).

Almost surely, 2^20304305 is an apocalyptic number.

It is an amenable number.

20304305 is a deficient number, since it is larger than the sum of its proper divisors (8296015).

20304305 is a wasteful number, since it uses less digits than its factorization.

20304305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15728.

The product of its (nonzero) digits is 360, while the sum is 17.

The square root of 20304305 is about 4506.0298489912. The cubic root of 20304305 is about 272.8115226412.

Adding to 20304305 its reverse (50340302), we get a palindrome (70644607).

The spelling of 20304305 in words is "twenty million, three hundred four thousand, three hundred five".