206209240 has 32 divisors (see below), whose sum is σ = 465917760. Its totient is φ = 82137600.

The previous prime is 206209231. The next prime is 206209247. The reversal of 206209240 is 42902602.

It is a super-2 number, since 2×206209240² = 85044501322755200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206209247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1056 + ... + 20335.

It is an arithmetic number, because the mean of its divisors is an integer number (14559930).

Almost surely, 2^206209240 is an apocalyptic number.

206209240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206209240 is an abundant number, since it is smaller than the sum of its proper divisors (259708520).

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

206209240 is a wasteful number, since it uses less digits than its factorization.

206209240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21643 (or 21639 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 206209240 is about 14359.9874651756. The cubic root of 206209240 is about 590.7939517031.

The spelling of 206209240 in words is "two hundred six million, two hundred nine thousand, two hundred forty".