206820673 has 2 divisors, whose sum is σ = 206820674. Its totient is φ = 206820672.

The previous prime is 206820637. The next prime is 206820707. The reversal of 206820673 is 376028602.

Together with previous prime (206820637) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (206820707) can be obtained adding 206820673 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201838849 + 4981824 = 14207^2 + 2232^2 .

It is a cyclic number.

It is not a de Polignac number, because 206820673 - 2¹⁷ = 206689601 is a prime.

It is not a weakly prime, because it can be changed into another prime (206820613) 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, 103410336 + 103410337.

It is an arithmetic number, because the mean of its divisors is an integer number (103410337).

Almost surely, 2^206820673 is an apocalyptic number.

It is an amenable number.

206820673 is a deficient number, since it is larger than the sum of its proper divisors (1).

206820673 is an equidigital number, since it uses as much as digits as its factorization.

206820673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 206820673 is about 14381.2611755715. The cubic root of 206820673 is about 591.3772984621.

The spelling of 206820673 in words is "two hundred six million, eight hundred twenty thousand, six hundred seventy-three".