206311730 has 8 divisors (see below), whose sum is σ = 371361132. Its totient is φ = 82524688.

The previous prime is 206311697. The next prime is 206311751. The reversal of 206311730 is 37113602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 204118369 + 2193361 = 14287^2 + 1481^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 206311696 and 206311705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10315577 + ... + 10315596.

Almost surely, 2^206311730 is an apocalyptic number.

206311730 is a deficient number, since it is larger than the sum of its proper divisors (165049402).

206311730 is a wasteful number, since it uses less digits than its factorization.

206311730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20631180.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 206311730 is about 14363.5556183001. Note that the first 3 decimals coincide. The cubic root of 206311730 is about 590.8918141838.

The spelling of 206311730 in words is "two hundred six million, three hundred eleven thousand, seven hundred thirty".