205520912 has 40 divisors (see below), whose sum is σ = 413913240. Its totient is φ = 98739200.

The previous prime is 205520911. The next prime is 205520957. The reversal of 205520912 is 219025502.

It can be written as a sum of positive squares in 4 ways, for example, as 16 + 205520896 = 4^2 + 14336^2 .

It is not an unprimeable number, because it can be changed into a prime (205520911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107162 + ... + 109062.

It is an arithmetic number, because the mean of its divisors is an integer number (10347831).

Almost surely, 2^205520912 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 205520912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206956620).

205520912 is an abundant number, since it is smaller than the sum of its proper divisors (208392328).

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

205520912 is a wasteful number, since it uses less digits than its factorization.

205520912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171 (or 2165 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 205520912 is about 14336.0005580357. Note that the first 3 decimals coincide. The cubic root of 205520912 is about 590.1358606977.

The spelling of 205520912 in words is "two hundred five million, five hundred twenty thousand, nine hundred twelve".