206664620 has 24 divisors (see below), whose sum is σ = 435489264. Its totient is φ = 82381376.

The previous prime is 206664613. The next prime is 206664677. The reversal of 206664620 is 26466602.

206664620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11774 + ... + 23493.

It is an arithmetic number, because the mean of its divisors is an integer number (18145386).

Almost surely, 2^206664620 is an apocalyptic number.

206664620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206664620 is an abundant number, since it is smaller than the sum of its proper divisors (228824644).

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

206664620 is a wasteful number, since it uses less digits than its factorization.

206664620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35569 (or 35567 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 206664620 is about 14375.8345844685. The cubic root of 206664620 is about 591.2285231633.

The spelling of 206664620 in words is "two hundred six million, six hundred sixty-four thousand, six hundred twenty".