204091400 has 24 divisors (see below), whose sum is σ = 474512970. Its totient is φ = 81636480.

The previous prime is 204091379. The next prime is 204091411. The reversal of 204091400 is 4190402.

It can be written as a sum of positive squares in 3 ways, for example, as 132756484 + 71334916 = 11522^2 + 8446^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510029 + ... + 510428.

Almost surely, 2^204091400 is an apocalyptic number.

204091400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204091400 is an abundant number, since it is smaller than the sum of its proper divisors (270421570).

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

204091400 is a wasteful number, since it uses less digits than its factorization.

204091400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020473 (or 1020464 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 204091400 is about 14286.0561387669. The cubic root of 204091400 is about 588.7644352854.

The spelling of 204091400 in words is "two hundred four million, ninety-one thousand, four hundred".