20304243 has 8 divisors (see below), whose sum is σ = 30080400. Its totient is φ = 13536144.

The previous prime is 20304227. The next prime is 20304253. The reversal of 20304243 is 34240302.

It is not a de Polignac number, because 20304243 - 2⁴ = 20304227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20304223) 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, 375978 + ... + 376031.

It is an arithmetic number, because the mean of its divisors is an integer number (3760050).

Almost surely, 2^20304243 is an apocalyptic number.

20304243 is a deficient number, since it is larger than the sum of its proper divisors (9776157).

20304243 is an equidigital number, since it uses as much as digits as its factorization.

20304243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752018 (or 752012 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20304243 is about 4506.0229693156. The cubic root of 20304243 is about 272.8112449606.

Adding to 20304243 its reverse (34240302), we get a palindrome (54544545).

The spelling of 20304243 in words is "twenty million, three hundred four thousand, two hundred forty-three".