204606640 has 40 divisors (see below), whose sum is σ = 543670560. Its totient is φ = 70150656.

The previous prime is 204606587. The next prime is 204606653. The reversal of 204606640 is 46606402.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 204606599 and 204606608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182125 + ... + 183244.

It is an arithmetic number, because the mean of its divisors is an integer number (13591764).

Almost surely, 2^204606640 is an apocalyptic number.

204606640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204606640 is an abundant number, since it is smaller than the sum of its proper divisors (339063920).

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

204606640 is a wasteful number, since it uses less digits than its factorization.

204606640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365389 (or 365383 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 204606640 is about 14304.0777402809. The cubic root of 204606640 is about 589.2594750344.

The spelling of 204606640 in words is "two hundred four million, six hundred six thousand, six hundred forty".