206204645 has 16 divisors (see below), whose sum is σ = 271038960. Its totient is φ = 149904384.

The previous prime is 206204641. The next prime is 206204657. The reversal of 206204645 is 546402602.

It can be written as a sum of positive squares in 8 ways, for example, as 17032129 + 189172516 = 4127^2 + 13754^2 .

It is a cyclic number.

It is not a de Polignac number, because 206204645 - 2² = 206204641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206204641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39362 + ... + 44291.

It is an arithmetic number, because the mean of its divisors is an integer number (16939935).

Almost surely, 2^206204645 is an apocalyptic number.

It is an amenable number.

206204645 is a deficient number, since it is larger than the sum of its proper divisors (64834315).

206204645 is a wasteful number, since it uses less digits than its factorization.

206204645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83704.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 206204645 is about 14359.8274711084. The cubic root of 206204645 is about 590.7895634122.

The spelling of 206204645 in words is "two hundred six million, two hundred four thousand, six hundred forty-five".