204490690 has 8 divisors (see below), whose sum is σ = 368083260. Its totient is φ = 81796272.

The previous prime is 204490679. The next prime is 204490697. The reversal of 204490690 is 96094402.

It can be written as a sum of positive squares in 2 ways, for example, as 196756729 + 7733961 = 14027^2 + 2781^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×204490690² = 83632884593352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204490697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10224525 + ... + 10224544.

Almost surely, 2^204490690 is an apocalyptic number.

204490690 is a deficient number, since it is larger than the sum of its proper divisors (163592570).

204490690 is a wasteful number, since it uses less digits than its factorization.

204490690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20449076.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 204490690 is about 14300.0241258538. The cubic root of 204490690 is about 589.1481434460.

The spelling of 204490690 in words is "two hundred four million, four hundred ninety thousand, six hundred ninety".