205970687 has 4 divisors (see below), whose sum is σ = 221814600. Its totient is φ = 190126776.

The previous prime is 205970671. The next prime is 205970701. The reversal of 205970687 is 786079502.

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

It is a cyclic number.

It is not a de Polignac number, because 205970687 - 2⁴ = 205970671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205970287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7921937 + ... + 7921962.

It is an arithmetic number, because the mean of its divisors is an integer number (55453650).

Almost surely, 2^205970687 is an apocalyptic number.

205970687 is a deficient number, since it is larger than the sum of its proper divisors (15843913).

205970687 is a wasteful number, since it uses less digits than its factorization.

205970687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15843912.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 205970687 is about 14351.6788913353. The cubic root of 205970687 is about 590.5660439533.

The spelling of 205970687 in words is "two hundred five million, nine hundred seventy thousand, six hundred eighty-seven".