206353640 has 16 divisors (see below), whose sum is σ = 464295780. Its totient is φ = 82541440.

The previous prime is 206353627. The next prime is 206353649. The reversal of 206353640 is 46353602.

It can be written as a sum of positive squares in 2 ways, for example, as 205234276 + 1119364 = 14326^2 + 1058^2 .

It is not an unprimeable number, because it can be changed into a prime (206353649) 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 3 ways as a sum of consecutive naturals, for example, 2579381 + ... + 2579460.

Almost surely, 2^206353640 is an apocalyptic number.

206353640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206353640 is an abundant number, since it is smaller than the sum of its proper divisors (257942140).

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

206353640 is a wasteful number, since it uses less digits than its factorization.

206353640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158852 (or 5158848 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 206353640 is about 14365.0144448239. The cubic root of 206353640 is about 590.9318225718.

The spelling of 206353640 in words is "two hundred six million, three hundred fifty-three thousand, six hundred forty".