206571136 has 32 divisors (see below), whose sum is σ = 416175300. Its totient is φ = 102119424.

The previous prime is 206571133. The next prime is 206571187. The reversal of 206571136 is 631175602.

It can be written as a sum of positive squares in 2 ways, for example, as 197571136 + 9000000 = 14056^2 + 3000^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 206571098 and 206571107.

It is not an unprimeable number, because it can be changed into a prime (206571133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2326 + ... + 20458.

Almost surely, 2^206571136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206571136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208087650).

206571136 is an abundant number, since it is smaller than the sum of its proper divisors (209604164).

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

206571136 is an equidigital number, since it uses as much as digits as its factorization.

206571136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18236 (or 18224 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 206571136 is about 14372.5827880726. The cubic root of 206571136 is about 591.1393630172.

The spelling of 206571136 in words is "two hundred six million, five hundred seventy-one thousand, one hundred thirty-six".