206646004 has 6 divisors (see below), whose sum is σ = 361630514. Its totient is φ = 103323000.

The previous prime is 206645963. The next prime is 206646029. The reversal of 206646004 is 400646602.

It can be written as a sum of positive squares in only one way, i.e., 185504400 + 21141604 = 13620^2 + 4598^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25830747 + ... + 25830754.

Almost surely, 2^206646004 is an apocalyptic number.

It is an amenable number.

206646004 is a deficient number, since it is larger than the sum of its proper divisors (154984510).

206646004 is a wasteful number, since it uses less digits than its factorization.

206646004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51661505 (or 51661503 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 206646004 is about 14375.1870944346. The cubic root of 206646004 is about 591.2107703412.

The spelling of 206646004 in words is "two hundred six million, six hundred forty-six thousand, four".