204138570 has 32 divisors (see below), whose sum is σ = 511235712. Its totient is φ = 52069952.

The previous prime is 204138463. The next prime is 204138577. The reversal of 204138570 is 75831402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204138577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147237 + ... + 148616.

It is an arithmetic number, because the mean of its divisors is an integer number (15976116).

Almost surely, 2^204138570 is an apocalyptic number.

204138570 is an abundant number, since it is smaller than the sum of its proper divisors (307097142).

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

204138570 is a wasteful number, since it uses less digits than its factorization.

204138570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295886.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 204138570 is about 14287.7069538817. The cubic root of 204138570 is about 588.8097905839.

Adding to 204138570 its reverse (75831402), we get a palindrome (279969972).

The spelling of 204138570 in words is "two hundred four million, one hundred thirty-eight thousand, five hundred seventy".