20304385 has 8 divisors (see below), whose sum is σ = 24932160. Its totient is φ = 15865584.

The previous prime is 20304313. The next prime is 20304413. The reversal of 20304385 is 58340302.

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

It is a cyclic number.

It is not a de Polignac number, because 20304385 - 2¹³ = 20296193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47005 + ... + 47434.

It is an arithmetic number, because the mean of its divisors is an integer number (3116520).

Almost surely, 2^20304385 is an apocalyptic number.

It is an amenable number.

20304385 is a deficient number, since it is larger than the sum of its proper divisors (4627775).

20304385 is an equidigital number, since it uses as much as digits as its factorization.

20304385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94487.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20304385 is about 4506.0387259765. The cubic root of 20304385 is about 272.8118809378.

Adding to 20304385 its reverse (58340302), we get a palindrome (78644687).

The spelling of 20304385 in words is "twenty million, three hundred four thousand, three hundred eighty-five".