204042440 has 32 divisors (see below), whose sum is σ = 524681280. Its totient is φ = 69957312.

The previous prime is 204042431. The next prime is 204042491. The reversal of 204042440 is 44240402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364082 + ... + 364641.

It is an arithmetic number, because the mean of its divisors is an integer number (16396290).

Almost surely, 2^204042440 is an apocalyptic number.

204042440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204042440 is an abundant number, since it is smaller than the sum of its proper divisors (320638840).

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

204042440 is a wasteful number, since it uses less digits than its factorization.

204042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728741 (or 728737 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 204042440 is about 14284.3424769921. The cubic root of 204042440 is about 588.7173514591.

Adding to 204042440 its reverse (44240402), we get a palindrome (248282842).

The spelling of 204042440 in words is "two hundred four million, forty-two thousand, four hundred forty".