20304685 has 8 divisors (see below), whose sum is σ = 24729696. Its totient is φ = 16001040.

The previous prime is 20304667. The next prime is 20304689. The reversal of 20304685 is 58640302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20304685 - 2⁹ = 20304173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29971 + ... + 30640.

It is an arithmetic number, because the mean of its divisors is an integer number (3091212).

Almost surely, 2^20304685 is an apocalyptic number.

It is an amenable number.

20304685 is a deficient number, since it is larger than the sum of its proper divisors (4425011).

20304685 is an equidigital number, since it uses as much as digits as its factorization.

20304685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60683.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20304685 is about 4506.0720145155. The cubic root of 20304685 is about 272.8132245419.

Adding to 20304685 its reverse (58640302), we get a palindrome (78944987).

The spelling of 20304685 in words is "twenty million, three hundred four thousand, six hundred eighty-five".