205520140 has 48 divisors (see below), whose sum is σ = 522268992. Its totient is φ = 66318336.

The previous prime is 205520137. The next prime is 205520141. The reversal of 205520140 is 41025502.

It is not an unprimeable number, because it can be changed into a prime (205520141) 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 15 ways as a sum of consecutive naturals, for example, 40797 + ... + 45556.

It is an arithmetic number, because the mean of its divisors is an integer number (10880604).

Almost surely, 2^205520140 is an apocalyptic number.

205520140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205520140 is an abundant number, since it is smaller than the sum of its proper divisors (316748852).

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

205520140 is a wasteful number, since it uses less digits than its factorization.

205520140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86386 (or 86384 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 205520140 is about 14335.9736327883. The cubic root of 205520140 is about 590.1351217859.

Adding to 205520140 its reverse (41025502), we get a palindrome (246545642).

The spelling of 205520140 in words is "two hundred five million, five hundred twenty thousand, one hundred forty".