205080689 has 4 divisors (see below), whose sum is σ = 223724400. Its totient is φ = 186436980.

The previous prime is 205080671. The next prime is 205080703. The reversal of 205080689 is 986080502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205080689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205086689) 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, 9321839 + ... + 9321860.

It is an arithmetic number, because the mean of its divisors is an integer number (55931100).

Almost surely, 2^205080689 is an apocalyptic number.

It is an amenable number.

205080689 is a deficient number, since it is larger than the sum of its proper divisors (18643711).

205080689 is a wasteful number, since it uses less digits than its factorization.

205080689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18643710.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 205080689 is about 14320.6385681645. The cubic root of 205080689 is about 589.7142051633.

The spelling of 205080689 in words is "two hundred five million, eighty thousand, six hundred eighty-nine".