204347840 has 28 divisors (see below), whose sum is σ = 486604056. Its totient is φ = 81739008.

The previous prime is 204347839. The next prime is 204347849. The reversal of 204347840 is 48743402.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 204347797 and 204347806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204347849) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 318974 + ... + 319613.

Almost surely, 2^204347840 is an apocalyptic number.

204347840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204347840 is an abundant number, since it is smaller than the sum of its proper divisors (282256216).

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

204347840 is an equidigital number, since it uses as much as digits as its factorization.

204347840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638604 (or 638594 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 204347840 is about 14295.0285064424. The cubic root of 204347840 is about 589.0109254356.

The spelling of 204347840 in words is "two hundred four million, three hundred forty-seven thousand, eight hundred forty".