206663730 has 256 divisors, whose sum is σ = 665957376. Its totient is φ = 39813120.

The previous prime is 206663707. The next prime is 206663761. The reversal of 206663730 is 37366602.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 206663691 and 206663700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2830974 + ... + 2831046.

It is an arithmetic number, because the mean of its divisors is an integer number (2601396).

Almost surely, 2^206663730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206663730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332978688).

206663730 is an abundant number, since it is smaller than the sum of its proper divisors (459293646).

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

206663730 is a wasteful number, since it uses less digits than its factorization.

206663730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181.

The product of its (nonzero) digits is 27216, while the sum is 33.

The square root of 206663730 is about 14375.8036297106. The cubic root of 206663730 is about 591.2276744546.

The spelling of 206663730 in words is "two hundred six million, six hundred sixty-three thousand, seven hundred thirty".