204020291 has 2 divisors, whose sum is σ = 204020292. Its totient is φ = 204020290.

The previous prime is 204020261. The next prime is 204020329. The reversal of 204020291 is 192020402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204020291 - 2¹⁰ = 204019267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (204020261) 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 as a sum of consecutive naturals, namely, 102010145 + 102010146.

It is an arithmetic number, because the mean of its divisors is an integer number (102010146).

Almost surely, 2^204020291 is an apocalyptic number.

204020291 is a deficient number, since it is larger than the sum of its proper divisors (1).

204020291 is an equidigital number, since it uses as much as digits as its factorization.

204020291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 204020291 is about 14283.5671665029. The cubic root of 204020291 is about 588.6960487463.

Adding to 204020291 its reverse (192020402), we get a palindrome (396040693).

The spelling of 204020291 in words is "two hundred four million, twenty thousand, two hundred ninety-one".