206470689 has 4 divisors (see below), whose sum is σ = 275294256. Its totient is φ = 137647124.

The previous prime is 206470643. The next prime is 206470699. The reversal of 206470689 is 986074602.

206470689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206470689 - 2²¹ = 204373537 is a prime.

It is a super-2 number, since 2×206470689² = 85260290832269442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206470689.

It is not an unprimeable number, because it can be changed into a prime (206470639) 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, 34411779 + ... + 34411784.

It is an arithmetic number, because the mean of its divisors is an integer number (68823564).

Almost surely, 2^206470689 is an apocalyptic number.

It is an amenable number.

206470689 is a deficient number, since it is larger than the sum of its proper divisors (68823567).

206470689 is an equidigital number, since it uses as much as digits as its factorization.

206470689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68823566.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 206470689 is about 14369.0879668822. The cubic root of 206470689 is about 591.0435319414.

The spelling of 206470689 in words is "two hundred six million, four hundred seventy thousand, six hundred eighty-nine".