204516840 has 64 divisors (see below), whose sum is σ = 669332160. Its totient is φ = 49579520.

The previous prime is 204516839. The next prime is 204516857. The reversal of 204516840 is 48615402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 204516798 and 204516807.

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 15 ways as a sum of consecutive naturals, for example, 76149 + ... + 78788.

It is an arithmetic number, because the mean of its divisors is an integer number (10458315).

Almost surely, 2^204516840 is an apocalyptic number.

204516840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204516840 is an abundant number, since it is smaller than the sum of its proper divisors (464815320).

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

204516840 is a wasteful number, since it uses less digits than its factorization.

204516840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154962 (or 154958 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 204516840 is about 14300.9384307464. The cubic root of 204516840 is about 589.1732555384.

The spelling of 204516840 in words is "two hundred four million, five hundred sixteen thousand, eight hundred forty".