20305430 has 16 divisors (see below), whose sum is σ = 36713520. Its totient is φ = 8085792.

The previous prime is 20305427. The next prime is 20305451. The reversal of 20305430 is 3450302.

It is a junction number, because it is equal to n+sod(n) for n = 20305399 and 20305408.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2144 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (2294595).

Almost surely, 2^20305430 is an apocalyptic number.

20305430 is a deficient number, since it is larger than the sum of its proper divisors (16408090).

20305430 is a wasteful number, since it uses less digits than its factorization.

20305430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9103.

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

The square root of 20305430 is about 4506.1546799905. The cubic root of 20305430 is about 272.8165611013.

Adding to 20305430 its reverse (3450302), we get a palindrome (23755732).

The spelling of 20305430 in words is "twenty million, three hundred five thousand, four hundred thirty".