205531004 has 48 divisors (see below), whose sum is σ = 436793280. Its totient is φ = 82736640.

The previous prime is 205530977. The next prime is 205531019. The reversal of 205531004 is 400135502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26624 + ... + 33464.

It is an arithmetic number, because the mean of its divisors is an integer number (9099860).

Almost surely, 2^205531004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205531004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218396640).

205531004 is an abundant number, since it is smaller than the sum of its proper divisors (231262276).

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

205531004 is a wasteful number, since it uses less digits than its factorization.

205531004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918 (or 6916 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 205531004 is about 14336.3525347279. The cubic root of 205531004 is about 590.1455199802.

Adding to 205531004 its reverse (400135502), we get a palindrome (605666506).

The spelling of 205531004 in words is "two hundred five million, five hundred thirty-one thousand, four".