204693640 has 16 divisors (see below), whose sum is σ = 460560780. Its totient is φ = 81877440.

The previous prime is 204693581. The next prime is 204693641. The reversal of 204693640 is 46396402.

It can be written as a sum of positive squares in 2 ways, for example, as 201810436 + 2883204 = 14206^2 + 1698^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204693596 and 204693605.

It is not an unprimeable number, because it can be changed into a prime (204693641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2558631 + ... + 2558710.

Almost surely, 2^204693640 is an apocalyptic number.

204693640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204693640 is an abundant number, since it is smaller than the sum of its proper divisors (255867140).

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

204693640 is a wasteful number, since it uses less digits than its factorization.

204693640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117352 (or 5117348 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 204693640 is about 14307.1185079316. The cubic root of 204693640 is about 589.3429821156.

The spelling of 204693640 in words is "two hundred four million, six hundred ninety-three thousand, six hundred forty".