204020357 has 2 divisors, whose sum is σ = 204020358. Its totient is φ = 204020356.

The previous prime is 204020353. The next prime is 204020359. The reversal of 204020357 is 753020402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140801956 + 63218401 = 11866^2 + 7951^2 .

It is a cyclic number.

It is not a de Polignac number, because 204020357 - 2² = 204020353 is a prime.

Together with 204020359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204020351) 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, 102010178 + 102010179.

It is an arithmetic number, because the mean of its divisors is an integer number (102010179).

Almost surely, 2^204020357 is an apocalyptic number.

It is an amenable number.

204020357 is a deficient number, since it is larger than the sum of its proper divisors (1).

204020357 is an equidigital number, since it uses as much as digits as its factorization.

204020357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 204020357 is about 14283.5694768500. The cubic root of 204020357 is about 588.6961122268.

Adding to 204020357 its reverse (753020402), we get a palindrome (957040759).

The spelling of 204020357 in words is "two hundred four million, twenty thousand, three hundred fifty-seven".