206643140 has 24 divisors (see below), whose sum is σ = 473401152. Its totient is φ = 75142880.

The previous prime is 206643139. The next prime is 206643167. The reversal of 206643140 is 41346602.

It is an unprimeable number.

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, 469424 + ... + 469863.

It is an arithmetic number, because the mean of its divisors is an integer number (19725048).

Almost surely, 2^206643140 is an apocalyptic number.

206643140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206643140 is an abundant number, since it is smaller than the sum of its proper divisors (266758012).

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

206643140 is a wasteful number, since it uses less digits than its factorization.

206643140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939307 (or 939305 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 206643140 is about 14375.0874779947. The cubic root of 206643140 is about 591.2080390432.

Adding to 206643140 its reverse (41346602), we get a palindrome (247989742).

It can be divided in two parts, 206 and 643140, that added together give a palindrome (643346).

The spelling of 206643140 in words is "two hundred six million, six hundred forty-three thousand, one hundred forty".