205663490 has 16 divisors (see below), whose sum is σ = 370381248. Its totient is φ = 82223856.

The previous prime is 205663483. The next prime is 205663511. The reversal of 205663490 is 94366502.

It is a super-2 number, since 2×205663490² = 84594942237960200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205663490.

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, 22769 + ... + 30491.

It is an arithmetic number, because the mean of its divisors is an integer number (23148828).

Almost surely, 2^205663490 is an apocalyptic number.

205663490 is a deficient number, since it is larger than the sum of its proper divisors (164717758).

205663490 is a wasteful number, since it uses less digits than its factorization.

205663490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10393.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 205663490 is about 14340.9724217014. The cubic root of 205663490 is about 590.2722960289.

The spelling of 205663490 in words is "two hundred five million, six hundred sixty-three thousand, four hundred ninety".