204220019 has 2 divisors, whose sum is σ = 204220020. Its totient is φ = 204220018.

The previous prime is 204220007. The next prime is 204220021. The reversal of 204220019 is 910022402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204220019 is a prime.

It is a super-2 number, since 2×204220019² = 83411632320720722, which contains 22 as substring.

Together with 204220021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204220039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102110009 + 102110010.

It is an arithmetic number, because the mean of its divisors is an integer number (102110010).

Almost surely, 2^204220019 is an apocalyptic number.

204220019 is a deficient number, since it is larger than the sum of its proper divisors (1).

204220019 is an equidigital number, since it uses as much as digits as its factorization.

204220019 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 204220019 is about 14290.5569870457. The cubic root of 204220019 is about 588.8880896723. Note that the first 3 decimals are identical.

The spelling of 204220019 in words is "two hundred four million, two hundred twenty thousand, nineteen".