206205345 has 20 divisors (see below), whose sum is σ = 369642900. Its totient is φ = 109975968.

The previous prime is 206205331. The next prime is 206205367. The reversal of 206205345 is 543502602.

206205345 is a `hidden beast` number, since 2 + 0 + 620 + 5 + 34 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 119771136 + 86434209 = 10944^2 + 9297^2 .

It is not a de Polignac number, because 206205345 - 2¹⁸ = 205943201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 254170 + ... + 254979.

It is an arithmetic number, because the mean of its divisors is an integer number (18482145).

Almost surely, 2^206205345 is an apocalyptic number.

It is an amenable number.

206205345 is a deficient number, since it is larger than the sum of its proper divisors (163437555).

206205345 is an equidigital number, since it uses as much as digits as its factorization.

206205345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509166 (or 509157 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 206205345 is about 14359.8518446396. The cubic root of 206205345 is about 590.7902319265.

Adding to 206205345 its reverse (543502602), we get a palindrome (749707947).

The spelling of 206205345 in words is "two hundred six million, two hundred five thousand, three hundred forty-five".