204686420 has 12 divisors (see below), whose sum is σ = 429841524. Its totient is φ = 81874560.

The previous prime is 204686381. The next prime is 204686423. The reversal of 204686420 is 24686402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 95609284 + 109077136 = 9778^2 + 10444^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204686423) 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, 5117141 + ... + 5117180.

It is an arithmetic number, because the mean of its divisors is an integer number (35820127).

Almost surely, 2^204686420 is an apocalyptic number.

204686420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204686420 is an abundant number, since it is smaller than the sum of its proper divisors (225155104).

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

204686420 is a wasteful number, since it uses less digits than its factorization.

204686420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10234330 (or 10234328 counting only the distinct ones).

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

The square root of 204686420 is about 14306.8661837595. The cubic root of 204686420 is about 589.3360528881.

The spelling of 204686420 in words is "two hundred four million, six hundred eighty-six thousand, four hundred twenty".