206730431 has 4 divisors (see below), whose sum is σ = 217611000. Its totient is φ = 195849864.

The previous prime is 206730427. The next prime is 206730457. The reversal of 206730431 is 134037602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206730431 - 2² = 206730427 is a prime.

It is a super-2 number, since 2×206730431² = 85474942202891522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206730431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206730481) 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, 5440256 + ... + 5440293.

It is an arithmetic number, because the mean of its divisors is an integer number (54402750).

Almost surely, 2^206730431 is an apocalyptic number.

206730431 is a deficient number, since it is larger than the sum of its proper divisors (10880569).

206730431 is a wasteful number, since it uses less digits than its factorization.

206730431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10880568.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 206730431 is about 14378.1233476417. The cubic root of 206730431 is about 591.2912741249.

The spelling of 206730431 in words is "two hundred six million, seven hundred thirty thousand, four hundred thirty-one".