204890690 has 32 divisors (see below), whose sum is σ = 378069120. Its totient is φ = 79922304.

The previous prime is 204890683. The next prime is 204890701. The reversal of 204890690 is 96098402.

It is a super-2 number, since 2×204890690² = 83960389697352200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 67526 + ... + 70494.

It is an arithmetic number, because the mean of its divisors is an integer number (11814660).

Almost surely, 2^204890690 is an apocalyptic number.

204890690 is a deficient number, since it is larger than the sum of its proper divisors (173178430).

204890690 is a wasteful number, since it uses less digits than its factorization.

204890690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3146.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 204890690 is about 14314.0032834983. The cubic root of 204890690 is about 589.5320334055.

The spelling of 204890690 in words is "two hundred four million, eight hundred ninety thousand, six hundred ninety".