206731660 has 24 divisors (see below), whose sum is σ = 434893536. Its totient is φ = 82548480.

The previous prime is 206731643. The next prime is 206731661. The reversal of 206731660 is 66137602.

It is not an unprimeable number, because it can be changed into a prime (206731661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3145 + ... + 20575.

It is an arithmetic number, because the mean of its divisors is an integer number (18120564).

Almost surely, 2^206731660 is an apocalyptic number.

206731660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206731660 is an abundant number, since it is smaller than the sum of its proper divisors (228161876).

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

206731660 is a wasteful number, since it uses less digits than its factorization.

206731660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18033 (or 18031 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 206731660 is about 14378.1660861182. The cubic root of 206731660 is about 591.2924458530.

The spelling of 206731660 in words is "two hundred six million, seven hundred thirty-one thousand, six hundred sixty".