20304355 has 4 divisors (see below), whose sum is σ = 24365232. Its totient is φ = 16243480.

The previous prime is 20304313. The next prime is 20304413. The reversal of 20304355 is 55340302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20304355 - 2⁷ = 20304227 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030431 + ... + 2030440.

It is an arithmetic number, because the mean of its divisors is an integer number (6091308).

Almost surely, 2^20304355 is an apocalyptic number.

20304355 is a deficient number, since it is larger than the sum of its proper divisors (4060877).

20304355 is an equidigital number, since it uses as much as digits as its factorization.

20304355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060876.

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 20304355 is about 4506.0353971091. The cubic root of 20304355 is about 272.8117465767.

Adding to 20304355 its reverse (55340302), we get a palindrome (75644657).

The spelling of 20304355 in words is "twenty million, three hundred four thousand, three hundred fifty-five".