204205440 has 64 divisors (see below), whose sum is σ = 650910960. Its totient is φ = 54454272.

The previous prime is 204205439. The next prime is 204205447. The reversal of 204205440 is 44502402.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204205447) 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, 51259 + ... + 55098.

Almost surely, 2^204205440 is an apocalyptic number.

204205440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204205440 is an abundant number, since it is smaller than the sum of its proper divisors (446705520).

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

204205440 is a wasteful number, since it uses less digits than its factorization.

204205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106379 (or 106367 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 204205440 is about 14290.0468858573. The cubic root of 204205440 is about 588.8740760221.

Adding to 204205440 its reverse (44502402), we get a palindrome (248707842).

The spelling of 204205440 in words is "two hundred four million, two hundred five thousand, four hundred forty".