206644426 has 4 divisors (see below), whose sum is σ = 309966642. Its totient is φ = 103322212.

The previous prime is 206644423. The next prime is 206644429. The reversal of 206644426 is 624446602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (206644423) and next prime (206644429).

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 88378801 = 10875^2 + 9401^2 .

It is a junction number, because it is equal to n+sod(n) for n = 206644391 and 206644400.

It is not an unprimeable number, because it can be changed into a prime (206644423) by changing a digit.

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, 51661105 + ... + 51661108.

Almost surely, 2^206644426 is an apocalyptic number.

206644426 is a deficient number, since it is larger than the sum of its proper divisors (103322216).

206644426 is a wasteful number, since it uses less digits than its factorization.

206644426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103322215.

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

The square root of 206644426 is about 14375.1322080877. The cubic root of 206644426 is about 591.2092654602.

The spelling of 206644426 in words is "two hundred six million, six hundred forty-four thousand, four hundred twenty-six".