206665240 has 16 divisors (see below), whose sum is σ = 464996880. Its totient is φ = 82666080.

The previous prime is 206665229. The next prime is 206665241. The reversal of 206665240 is 42566602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206665241) 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, 2583276 + ... + 2583355.

It is an arithmetic number, because the mean of its divisors is an integer number (29062305).

Almost surely, 2^206665240 is an apocalyptic number.

206665240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206665240 is an abundant number, since it is smaller than the sum of its proper divisors (258331640).

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

206665240 is a wasteful number, since it uses less digits than its factorization.

206665240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166642 (or 5166638 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 206665240 is about 14375.8561484177. The cubic root of 206665240 is about 591.2291143971.

The spelling of 206665240 in words is "two hundred six million, six hundred sixty-five thousand, two hundred forty".