206639432 has 8 divisors (see below), whose sum is σ = 387448950. Its totient is φ = 103319712.

The previous prime is 206639387. The next prime is 206639441. The reversal of 206639432 is 234936602.

It can be written as a sum of positive squares in only one way, i.e., 206611876 + 27556 = 14374^2 + 166^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 206639392 and 206639401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12914957 + ... + 12914972.

Almost surely, 2^206639432 is an apocalyptic number.

It is an amenable number.

206639432 is a deficient number, since it is larger than the sum of its proper divisors (180809518).

206639432 is a wasteful number, since it uses less digits than its factorization.

206639432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25829935 (or 25829931 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 206639432 is about 14374.9585042879. The cubic root of 206639432 is about 591.2045028140.

The spelling of 206639432 in words is "two hundred six million, six hundred thirty-nine thousand, four hundred thirty-two".