205511140 has 12 divisors (see below), whose sum is σ = 431573436. Its totient is φ = 82204448.

The previous prime is 205511129. The next prime is 205511149. The reversal of 205511140 is 41115502.

205511140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 22071204 + 183439936 = 4698^2 + 13544^2 .

It is not an unprimeable number, because it can be changed into a prime (205511149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5137759 + ... + 5137798.

It is an arithmetic number, because the mean of its divisors is an integer number (35964453).

Almost surely, 2^205511140 is an apocalyptic number.

205511140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205511140 is an abundant number, since it is smaller than the sum of its proper divisors (226062296).

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

205511140 is a wasteful number, since it uses less digits than its factorization.

205511140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275566 (or 10275564 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 205511140 is about 14335.6597336851. The cubic root of 205511140 is about 590.1265073932.

Adding to 205511140 its reverse (41115502), we get a palindrome (246626642).

The spelling of 205511140 in words is "two hundred five million, five hundred eleven thousand, one hundred forty".