206639320 has 16 divisors (see below), whose sum is σ = 464938560. Its totient is φ = 82655712.

The previous prime is 206639311. The next prime is 206639327. The reversal of 206639320 is 23936602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206639327) 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, 2582952 + ... + 2583031.

It is an arithmetic number, because the mean of its divisors is an integer number (29058660).

Almost surely, 2^206639320 is an apocalyptic number.

206639320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206639320 is an abundant number, since it is smaller than the sum of its proper divisors (258299240).

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

206639320 is a wasteful number, since it uses less digits than its factorization.

206639320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165994 (or 5165990 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 206639320 is about 14374.9546086240. The cubic root of 206639320 is about 591.2043960016.

The spelling of 206639320 in words is "two hundred six million, six hundred thirty-nine thousand, three hundred twenty".