206442646 has 4 divisors (see below), whose sum is σ = 309663972. Its totient is φ = 103221322.

The previous prime is 206442637. The next prime is 206442673. The reversal of 206442646 is 646244602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646244602 = 2 ⋅323122301.

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 as a sum of consecutive naturals, namely, 51610660 + ... + 51610663.

It is an arithmetic number, because the mean of its divisors is an integer number (77415993).

Almost surely, 2^206442646 is an apocalyptic number.

206442646 is a deficient number, since it is larger than the sum of its proper divisors (103221326).

206442646 is a wasteful number, since it uses less digits than its factorization.

206442646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103221325.

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 206442646 is about 14368.1121237273. The cubic root of 206442646 is about 591.0167720749.

The spelling of 206442646 in words is "two hundred six million, four hundred forty-two thousand, six hundred forty-six".