206505345 has 16 divisors (see below), whose sum is σ = 330587712. Its totient is φ = 110076480.

The previous prime is 206505311. The next prime is 206505347. The reversal of 206505345 is 543505602.

It is not a de Polignac number, because 206505345 - 2⁷ = 206505217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206505347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47899 + ... + 52031.

It is an arithmetic number, because the mean of its divisors is an integer number (20661732).

Almost surely, 2^206505345 is an apocalyptic number.

It is an amenable number.

206505345 is a deficient number, since it is larger than the sum of its proper divisors (124082367).

206505345 is a wasteful number, since it uses less digits than its factorization.

206505345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7472.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 206505345 is about 14370.2938383319. The cubic root of 206505345 is about 591.0765988766.

The spelling of 206505345 in words is "two hundred six million, five hundred five thousand, three hundred forty-five".