205404440 has 32 divisors (see below), whose sum is σ = 486486000. Its totient is φ = 77837184.

The previous prime is 205404431. The next prime is 205404443. The reversal of 205404440 is 44404502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205404443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134375 + ... + 135894.

Almost surely, 2^205404440 is an apocalyptic number.

205404440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205404440 is an abundant number, since it is smaller than the sum of its proper divisors (281081560).

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

205404440 is a wasteful number, since it uses less digits than its factorization.

205404440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270299 (or 270295 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 205404440 is about 14331.9377615171. The cubic root of 205404440 is about 590.0243598101.

Adding to 205404440 its reverse (44404502), we get a palindrome (249808942).

The spelling of 205404440 in words is "two hundred five million, four hundred four thousand, four hundred forty".