204820989493 has 2 divisors, whose sum is σ = 204820989494. Its totient is φ = 204820989492.

The previous prime is 204820989491. The next prime is 204820989509. The reversal of 204820989493 is 394989028402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163136825604 + 41684163889 = 403902^2 + 204167^2 .

It is a cyclic number.

It is not a de Polignac number, because 204820989493 - 2¹ = 204820989491 is a prime.

Together with 204820989491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204820989491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102410494746 + 102410494747.

It is an arithmetic number, because the mean of its divisors is an integer number (102410494747).

Almost surely, 2^204820989493 is an apocalyptic number.

It is an amenable number.

204820989493 is a deficient number, since it is larger than the sum of its proper divisors (1).

204820989493 is an equidigital number, since it uses as much as digits as its factorization.

204820989493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8957952, while the sum is 58.

The spelling of 204820989493 in words is "two hundred four billion, eight hundred twenty million, nine hundred eighty-nine thousand, four hundred ninety-three".