204251420 has 24 divisors (see below), whose sum is σ = 429204048. Its totient is φ = 81648000.

The previous prime is 204251393. The next prime is 204251423. The reversal of 204251420 is 24152402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 204251392 and 204251401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204251423) 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 7 ways as a sum of consecutive naturals, for example, 48395 + ... + 52445.

It is an arithmetic number, because the mean of its divisors is an integer number (17883502).

Almost surely, 2^204251420 is an apocalyptic number.

204251420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204251420 is an abundant number, since it is smaller than the sum of its proper divisors (224952628).

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

204251420 is a wasteful number, since it uses less digits than its factorization.

204251420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6581 (or 6579 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 204251420 is about 14291.6556073815. The cubic root of 204251420 is about 588.9182707279.

The spelling of 204251420 in words is "two hundred four million, two hundred fifty-one thousand, four hundred twenty".