20304345 has 16 divisors (see below), whose sum is σ = 32738112. Its totient is φ = 10745280.

The previous prime is 20304313. The next prime is 20304413. The reversal of 20304345 is 54340302.

It is a happy number.

It is not a de Polignac number, because 20304345 - 2⁵ = 20304313 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3202 + ... + 7131.

It is an arithmetic number, because the mean of its divisors is an integer number (2046132).

Almost surely, 2^20304345 is an apocalyptic number.

It is an amenable number.

20304345 is a deficient number, since it is larger than the sum of its proper divisors (12433767).

20304345 is a wasteful number, since it uses less digits than its factorization.

20304345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10472.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20304345 is about 4506.0342874861. The cubic root of 20304345 is about 272.8117017896.

Adding to 20304345 its reverse (54340302), we get a palindrome (74644647).

The spelling of 20304345 in words is "twenty million, three hundred four thousand, three hundred forty-five".