206720205205 has 8 divisors (see below), whose sum is σ = 250520328504. Its totient is φ = 163738776000.

The previous prime is 206720205157. The next prime is 206720205229. The reversal of 206720205205 is 502502027602.

It can be written as a sum of positive squares in 4 ways, for example, as 95595982596 + 111124222609 = 309186^2 + 333353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206720205205 - 2⁷ = 206720205077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204672966 + ... + 204673975.

It is an arithmetic number, because the mean of its divisors is an integer number (31315041063).

Almost surely, 2^206720205205 is an apocalyptic number.

It is an amenable number.

206720205205 is a deficient number, since it is larger than the sum of its proper divisors (43800123299).

206720205205 is a wasteful number, since it uses less digits than its factorization.

206720205205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409347047.

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 206720205205 in words is "two hundred six billion, seven hundred twenty million, two hundred five thousand, two hundred five".