204387440 has 20 divisors (see below), whose sum is σ = 475200984. Its totient is φ = 81754944.

The previous prime is 204387437. The next prime is 204387461. The reversal of 204387440 is 44783402.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 204387397 and 204387406.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1277342 + ... + 1277501.

Almost surely, 2^204387440 is an apocalyptic number.

204387440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204387440 is an abundant number, since it is smaller than the sum of its proper divisors (270813544).

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

204387440 is a wasteful number, since it uses less digits than its factorization.

204387440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554856 (or 2554850 counting only the distinct ones).

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

The square root of 204387440 is about 14296.4135362685. The cubic root of 204387440 is about 589.0489705749.

The spelling of 204387440 in words is "two hundred four million, three hundred eighty-seven thousand, four hundred forty".