20304684 has 36 divisors (see below), whose sum is σ = 51532936. Its totient is φ = 6740928.

The previous prime is 20304667. The next prime is 20304689. The reversal of 20304684 is 48640302.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (20304689) 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 11 ways as a sum of consecutive naturals, for example, 9192 + ... + 11184.

Almost surely, 2^20304684 is an apocalyptic number.

It is an amenable number.

20304684 is an abundant number, since it is smaller than the sum of its proper divisors (31228252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20304684 is a wasteful number, since it uses less digits than its factorization.

20304684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2286 (or 2281 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20304684 is about 4506.0719035541. The cubic root of 20304684 is about 272.8132200632.

Adding to 20304684 its reverse (48640302), we get a palindrome (68944986).

It can be divided in two parts, 20 and 304684, that added together give a square (304704 = 552²).

The spelling of 20304684 in words is "twenty million, three hundred four thousand, six hundred eighty-four".