205560987 has 4 divisors (see below), whose sum is σ = 274081320. Its totient is φ = 137040656.

The previous prime is 205560983. The next prime is 205561007. The reversal of 205560987 is 789065502.

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 205560987 - 2² = 205560983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205560983) 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, 34260162 + ... + 34260167.

It is an arithmetic number, because the mean of its divisors is an integer number (68520330).

Almost surely, 2^205560987 is an apocalyptic number.

205560987 is a deficient number, since it is larger than the sum of its proper divisors (68520333).

205560987 is an equidigital number, since it uses as much as digits as its factorization.

205560987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68520332.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 205560987 is about 14337.3981949306. The cubic root of 205560987 is about 590.1742155256.

The spelling of 205560987 in words is "two hundred five million, five hundred sixty thousand, nine hundred eighty-seven".