206520605 has 16 divisors (see below), whose sum is σ = 256295424. Its totient is φ = 159589440.

The previous prime is 206520553. The next prime is 206520619. The reversal of 206520605 is 506025602.

It is a happy number.

It is not a de Polignac number, because 206520605 - 2¹⁰ = 206519581 is a prime.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 121139 + ... + 122831.

It is an arithmetic number, because the mean of its divisors is an integer number (16018464).

Almost surely, 2^206520605 is an apocalyptic number.

It is an amenable number.

206520605 is a deficient number, since it is larger than the sum of its proper divisors (49774819).

206520605 is a wasteful number, since it uses less digits than its factorization.

206520605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 206520605 is about 14370.8247849593. The cubic root of 206520605 is about 591.0911579941.

The spelling of 206520605 in words is "two hundred six million, five hundred twenty thousand, six hundred five".