205500172 has 12 divisors (see below), whose sum is σ = 364178080. Its totient is φ = 101449296.

The previous prime is 205500161. The next prime is 205500173. The reversal of 205500172 is 271005502.

It is not an unprimeable number, because it can be changed into a prime (205500173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324843 + ... + 325474.

Almost surely, 2^205500172 is an apocalyptic number.

It is an amenable number.

205500172 is a deficient number, since it is larger than the sum of its proper divisors (158677908).

205500172 is a wasteful number, since it uses less digits than its factorization.

205500172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650400 (or 650398 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 205500172 is about 14335.2771860191. The cubic root of 205500172 is about 590.1160089798.

Adding to 205500172 its reverse (271005502), we get a palindrome (476505674).

The spelling of 205500172 in words is "two hundred five million, five hundred thousand, one hundred seventy-two".