206042005 has 16 divisors (see below), whose sum is σ = 271298160. Its totient is φ = 149280768.

The previous prime is 206041987. The next prime is 206042009. The reversal of 206042005 is 500240602.

It can be written as a sum of positive squares in 8 ways, for example, as 463761 + 205578244 = 681^2 + 14338^2 .

It is not a de Polignac number, because 206042005 - 2⁵ = 206041973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206042009) 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, 26460 + ... + 33349.

It is an arithmetic number, because the mean of its divisors is an integer number (16956135).

Almost surely, 2^206042005 is an apocalyptic number.

It is an amenable number.

206042005 is a deficient number, since it is larger than the sum of its proper divisors (65256155).

206042005 is a wasteful number, since it uses less digits than its factorization.

206042005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59880.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 206042005 is about 14354.1633333329. The cubic root of 206042005 is about 590.6341978729.

Adding to 206042005 its reverse (500240602), we get a palindrome (706282607).

The spelling of 206042005 in words is "two hundred six million, forty-two thousand, five".