204820613 has 2 divisors, whose sum is σ = 204820614. Its totient is φ = 204820612.

The previous prime is 204820537. The next prime is 204820621. The reversal of 204820613 is 316028402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204118369 + 702244 = 14287^2 + 838^2 .

It is a cyclic number.

It is not a de Polignac number, because 204820613 - 2¹⁸ = 204558469 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204820663) 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, 102410306 + 102410307.

It is an arithmetic number, because the mean of its divisors is an integer number (102410307).

Almost surely, 2^204820613 is an apocalyptic number.

It is an amenable number.

204820613 is a deficient number, since it is larger than the sum of its proper divisors (1).

204820613 is an equidigital number, since it uses as much as digits as its factorization.

204820613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 204820613 is about 14311.5552264595. Note that the first 3 decimals coincide. The cubic root of 204820613 is about 589.4648148850.

The spelling of 204820613 in words is "two hundred four million, eight hundred twenty thousand, six hundred thirteen".