206531864 has 96 divisors (see below), whose sum is σ = 495927360. Its totient is φ = 79732800.

The previous prime is 206531863. The next prime is 206531879. The reversal of 206531864 is 468135602.

206531864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206531863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 909719 + ... + 909945.

It is an arithmetic number, because the mean of its divisors is an integer number (5165910).

Almost surely, 2^206531864 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 206531864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247963680).

206531864 is an abundant number, since it is smaller than the sum of its proper divisors (289395496).

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

206531864 is a wasteful number, since it uses less digits than its factorization.

206531864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 206531864 is about 14371.2165107899. The cubic root of 206531864 is about 591.1018994153.

The spelling of 206531864 in words is "two hundred six million, five hundred thirty-one thousand, eight hundred sixty-four".