206011305 has 12 divisors (see below), whose sum is σ = 357086340. Its totient is φ = 109872672.

The previous prime is 206011297. The next prime is 206011313. The reversal of 206011305 is 503110602.

It is an interprime number because it is at equal distance from previous prime (206011297) and next prime (206011313).

It can be written as a sum of positive squares in 2 ways, for example, as 95004009 + 111007296 = 9747^2 + 10536^2 .

It is not a de Polignac number, because 206011305 - 2³ = 206011297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2288970 + ... + 2289059.

It is an arithmetic number, because the mean of its divisors is an integer number (29757195).

Almost surely, 2^206011305 is an apocalyptic number.

It is an amenable number.

206011305 is a deficient number, since it is larger than the sum of its proper divisors (151075035).

206011305 is a wasteful number, since it uses less digits than its factorization.

206011305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578040 (or 4578037 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 206011305 is about 14353.0939173406. The cubic root of 206011305 is about 590.6048618312.

Adding to 206011305 its reverse (503110602), we get a palindrome (709121907).

The spelling of 206011305 in words is "two hundred six million, eleven thousand, three hundred five".