204420866 has 16 divisors (see below), whose sum is σ = 334200384. Its totient is φ = 93210384.

The previous prime is 204420863. The next prime is 204420871. The reversal of 204420866 is 668024402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (204420863) 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, 45206 + ... + 49521.

It is an arithmetic number, because the mean of its divisors is an integer number (20887524).

Almost surely, 2^204420866 is an apocalyptic number.

204420866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

204420866 is a deficient number, since it is larger than the sum of its proper divisors (129779518).

204420866 is a wasteful number, since it uses less digits than its factorization.

204420866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94825.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 204420866 is about 14297.5825229302. The cubic root of 204420866 is about 589.0810803066.

The spelling of 204420866 in words is "two hundred four million, four hundred twenty thousand, eight hundred sixty-six".