206690090 has 8 divisors (see below), whose sum is σ = 372042180. Its totient is φ = 82676032.

The previous prime is 206690059. The next prime is 206690147. The reversal of 206690090 is 90096602.

206690090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 178249201 + 28440889 = 13351^2 + 5333^2 .

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

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, 10334495 + ... + 10334514.

Almost surely, 2^206690090 is an apocalyptic number.

206690090 is a deficient number, since it is larger than the sum of its proper divisors (165352090).

206690090 is a wasteful number, since it uses less digits than its factorization.

206690090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20669016.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 206690090 is about 14376.7204187881. The cubic root of 206690090 is about 591.2528104553.

The spelling of 206690090 in words is "two hundred six million, six hundred ninety thousand, ninety".