206668444 has 18 divisors (see below), whose sum is σ = 373625952. Its totient is φ = 99923400.

The previous prime is 206668393. The next prime is 206668463. The reversal of 206668444 is 444866602.

It is a super-2 number, since 2×206668444² = 85423691490762272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206668397 and 206668406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159439 + ... + 160729.

Almost surely, 2^206668444 is an apocalyptic number.

It is an amenable number.

206668444 is a deficient number, since it is larger than the sum of its proper divisors (166957508).

206668444 is an equidigital number, since it uses as much as digits as its factorization.

206668444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 206668444 is about 14375.9675848271. The cubic root of 206668444 is about 591.2321697219.

The spelling of 206668444 in words is "two hundred six million, six hundred sixty-eight thousand, four hundred forty-four".