204020321 has 4 divisors (see below), whose sum is σ = 204426432. Its totient is φ = 203614212.

The previous prime is 204020291. The next prime is 204020329. The reversal of 204020321 is 123020402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204020321 - 2¹⁰ = 204019297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204020296 and 204020305.

It is not an unprimeable number, because it can be changed into a prime (204020329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202301 + ... + 203306.

It is an arithmetic number, because the mean of its divisors is an integer number (51106608).

Almost surely, 2^204020321 is an apocalyptic number.

It is an amenable number.

204020321 is a deficient number, since it is larger than the sum of its proper divisors (406111).

204020321 is an equidigital number, since it uses as much as digits as its factorization.

204020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406110.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 204020321 is about 14283.5682166607. The cubic root of 204020321 is about 588.6960776011.

Adding to 204020321 its reverse (123020402), we get a palindrome (327040723).

The spelling of 204020321 in words is "two hundred four million, twenty thousand, three hundred twenty-one".