205513240 has 16 divisors (see below), whose sum is σ = 462404880. Its totient is φ = 82205280.

The previous prime is 205513237. The next prime is 205513247. The reversal of 205513240 is 42315502.

205513240 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 (205513247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2568876 + ... + 2568955.

It is an arithmetic number, because the mean of its divisors is an integer number (28900305).

Almost surely, 2^205513240 is an apocalyptic number.

205513240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205513240 is an abundant number, since it is smaller than the sum of its proper divisors (256891640).

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

205513240 is a wasteful number, since it uses less digits than its factorization.

205513240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137842 (or 5137838 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 205513240 is about 14335.7329774239. The cubic root of 205513240 is about 590.1285174406.

Adding to 205513240 its reverse (42315502), we get a palindrome (247828742).

The spelling of 205513240 in words is "two hundred five million, five hundred thirteen thousand, two hundred forty".