206117988 has 24 divisors (see below), whose sum is σ = 492673440. Its totient is φ = 67030080.

The previous prime is 206117987. The next prime is 206117999. The reversal of 206117988 is 889711602.

It is not an unprimeable number, because it can be changed into a prime (206117981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208978 + ... + 209961.

It is an arithmetic number, because the mean of its divisors is an integer number (20528060).

Almost surely, 2^206117988 is an apocalyptic number.

It is an amenable number.

206117988 is an abundant number, since it is smaller than the sum of its proper divisors (286555452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206117988 is a wasteful number, since it uses less digits than its factorization.

206117988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418987 (or 418985 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 206117988 is about 14356.8098127683. The cubic root of 206117988 is about 590.7067925245.

The spelling of 206117988 in words is "two hundred six million, one hundred seventeen thousand, nine hundred eighty-eight".