206561140 has 24 divisors (see below), whose sum is σ = 441965160. Its totient is φ = 81065088.

The previous prime is 206561123. The next prime is 206561143. The reversal of 206561140 is 41165602.

It can be written as a sum of positive squares in 4 ways, for example, as 86527204 + 120033936 = 9302^2 + 10956^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206561143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96375 + ... + 98494.

It is an arithmetic number, because the mean of its divisors is an integer number (18415215).

Almost surely, 2^206561140 is an apocalyptic number.

206561140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206561140 is an abundant number, since it is smaller than the sum of its proper divisors (235404020).

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

206561140 is a wasteful number, since it uses less digits than its factorization.

206561140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194931 (or 194929 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 206561140 is about 14372.2350384343. The cubic root of 206561140 is about 591.1298277638.

The spelling of 206561140 in words is "two hundred six million, five hundred sixty-one thousand, one hundred forty".