206321604 has 12 divisors (see below), whose sum is σ = 481417104. Its totient is φ = 68773864.

The previous prime is 206321603. The next prime is 206321617. The reversal of 206321604 is 406123602.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (206321603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8596722 + ... + 8596745.

It is an arithmetic number, because the mean of its divisors is an integer number (40118092).

Almost surely, 2^206321604 is an apocalyptic number.

It is an amenable number.

206321604 is an abundant number, since it is smaller than the sum of its proper divisors (275095500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206321604 is a wasteful number, since it uses less digits than its factorization.

206321604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17193474 (or 17193472 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 206321604 is about 14363.8993313097. The cubic root of 206321604 is about 590.9012406517.

The spelling of 206321604 in words is "two hundred six million, three hundred twenty-one thousand, six hundred four".