204220789 has 2 divisors, whose sum is σ = 204220790. Its totient is φ = 204220788.

The previous prime is 204220787. The next prime is 204220801. The reversal of 204220789 is 987022402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189282564 + 14938225 = 13758^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 204220789 - 2¹ = 204220787 is a prime.

It is a super-2 number, since 2×204220789² = 83412261319565042, which contains 22 as substring.

Together with 204220787, 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 (204220787) 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, 102110394 + 102110395.

It is an arithmetic number, because the mean of its divisors is an integer number (102110395).

Almost surely, 2^204220789 is an apocalyptic number.

It is an amenable number.

204220789 is a deficient number, since it is larger than the sum of its proper divisors (1).

204220789 is an equidigital number, since it uses as much as digits as its factorization.

204220789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 204220789 is about 14290.5839278876. The cubic root of 204220789 is about 588.8888297944. Note that the first 4 decimals are identical.

The spelling of 204220789 in words is "two hundred four million, two hundred twenty thousand, seven hundred eighty-nine".