206093905 has 4 divisors (see below), whose sum is σ = 247312692. Its totient is φ = 164875120.

The previous prime is 206093891. The next prime is 206093933. The reversal of 206093905 is 509390602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31404816 + 174689089 = 5604^2 + 13217^2 .

It is a de Polignac number, because none of the positive numbers 2^k-206093905 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 20609386 + ... + 20609395.

It is an arithmetic number, because the mean of its divisors is an integer number (61828173).

Almost surely, 2^206093905 is an apocalyptic number.

It is an amenable number.

206093905 is a deficient number, since it is larger than the sum of its proper divisors (41218787).

206093905 is an equidigital number, since it uses as much as digits as its factorization.

206093905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41218786.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 206093905 is about 14355.9710573684. The cubic root of 206093905 is about 590.6837854014.

The spelling of 206093905 in words is "two hundred six million, ninety-three thousand, nine hundred five".