206651990 has 32 divisors (see below), whose sum is σ = 377372736. Its totient is φ = 81469440.

The previous prime is 206651953. The next prime is 206652011. The reversal of 206651990 is 99156602.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 322070 + ... + 322710.

It is an arithmetic number, because the mean of its divisors is an integer number (11792898).

Almost surely, 2^206651990 is an apocalyptic number.

206651990 is a deficient number, since it is larger than the sum of its proper divisors (170720746).

206651990 is a wasteful number, since it uses less digits than its factorization.

206651990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 206651990 is about 14375.3952989127. The cubic root of 206651990 is about 591.2164789015.

The spelling of 206651990 in words is "two hundred six million, six hundred fifty-one thousand, nine hundred ninety".