206445005 has 8 divisors (see below), whose sum is σ = 266790552. Its totient is φ = 152451648.

The previous prime is 206444993. The next prime is 206445007. The reversal of 206445005 is 500544602.

206445005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 40627876 + 165817129 = 6374^2 + 12877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206445005 - 2⁴ = 206444989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206445007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587974 + ... + 1588103.

It is an arithmetic number, because the mean of its divisors is an integer number (33348819).

Almost surely, 2^206445005 is an apocalyptic number.

It is an amenable number.

206445005 is a deficient number, since it is larger than the sum of its proper divisors (60345547).

206445005 is a wasteful number, since it uses less digits than its factorization.

206445005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176095.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 206445005 is about 14368.1942150014. The cubic root of 206445005 is about 591.0190232300.

Adding to 206445005 its reverse (500544602), we get a palindrome (706989607).

The spelling of 206445005 in words is "two hundred six million, four hundred forty-five thousand, five".