204247540 has 24 divisors (see below), whose sum is σ = 490194432. Its totient is φ = 70027680.

The previous prime is 204247523. The next prime is 204247541. The reversal of 204247540 is 45742402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 204247499 and 204247508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204247541) 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, 729316 + ... + 729595.

It is an arithmetic number, because the mean of its divisors is an integer number (20424768).

Almost surely, 2^204247540 is an apocalyptic number.

204247540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204247540 is an abundant number, since it is smaller than the sum of its proper divisors (285946892).

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

204247540 is a wasteful number, since it uses less digits than its factorization.

204247540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458927 (or 1458925 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 204247540 is about 14291.5198631916. The cubic root of 204247540 is about 588.9145416353.

Adding to 204247540 its reverse (45742402), we get a palindrome (249989942).

The spelling of 204247540 in words is "two hundred four million, two hundred forty-seven thousand, five hundred forty".