20304039 has 16 divisors (see below), whose sum is σ = 31938560. Its totient is φ = 11227680.

The previous prime is 20304029. The next prime is 20304049. The reversal of 20304039 is 93040302.

It is an interprime number because it is at equal distance from previous prime (20304029) and next prime (20304049).

It is not a de Polignac number, because 20304039 - 2⁴ = 20304023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14944 + ... + 16245.

It is an arithmetic number, because the mean of its divisors is an integer number (1996160).

Almost surely, 2^20304039 is an apocalyptic number.

20304039 is a deficient number, since it is larger than the sum of its proper divisors (11634521).

20304039 is a wasteful number, since it uses less digits than its factorization.

20304039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31230.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20304039 is about 4506.0003328895. Note that the first 3 decimals coincide. The cubic root of 20304039 is about 272.8103312981.

The spelling of 20304039 in words is "twenty million, three hundred four thousand, thirty-nine".