204691240 has 32 divisors (see below), whose sum is σ = 495983880. Its totient is φ = 75578112.

The previous prime is 204691183. The next prime is 204691241. The reversal of 204691240 is 42196402.

It can be written as a sum of positive squares in 4 ways, for example, as 162154756 + 42536484 = 12734^2 + 6522^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204691199 and 204691208.

It is not an unprimeable number, because it can be changed into a prime (204691241) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 196299 + ... + 197338.

Almost surely, 2^204691240 is an apocalyptic number.

204691240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204691240 is an abundant number, since it is smaller than the sum of its proper divisors (291292640).

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

204691240 is a wasteful number, since it uses less digits than its factorization.

204691240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393661 (or 393657 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 204691240 is about 14307.0346333543. The cubic root of 204691240 is about 589.3406787893.

The spelling of 204691240 in words is "two hundred four million, six hundred ninety-one thousand, two hundred forty".