20304743 has 4 divisors (see below), whose sum is σ = 20393640. Its totient is φ = 20215848.

The previous prime is 20304733. The next prime is 20304751. The reversal of 20304743 is 34740302.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20304743 - 2¹⁰ = 20303719 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 (20304733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44105 + ... + 44562.

It is an arithmetic number, because the mean of its divisors is an integer number (5098410).

Almost surely, 2^20304743 is an apocalyptic number.

20304743 is a deficient number, since it is larger than the sum of its proper divisors (88897).

20304743 is an equidigital number, since it uses as much as digits as its factorization.

20304743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88896.

The product of its (nonzero) digits is 2016, while the sum is 23.

The square root of 20304743 is about 4506.0784502714. The cubic root of 20304743 is about 272.8134843038.

The spelling of 20304743 in words is "twenty million, three hundred four thousand, seven hundred forty-three".