205591040 has 40 divisors (see below), whose sum is σ = 492942780. Its totient is φ = 82235392.

The previous prime is 205591037. The next prime is 205591049. The reversal of 205591040 is 40195502.

It can be written as a sum of positive squares in 2 ways, for example, as 202322176 + 3268864 = 14224^2 + 1808^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (205591049) 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, 37595 + ... + 42714.

Almost surely, 2^205591040 is an apocalyptic number.

205591040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205591040 is an abundant number, since it is smaller than the sum of its proper divisors (287351740).

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

205591040 is an frugal number, since it uses more digits than its factorization.

205591040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80332 (or 80316 counting only the distinct ones).

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

The square root of 205591040 is about 14338.4462198664. The cubic root of 205591040 is about 590.2029752652.

The spelling of 205591040 in words is "two hundred five million, five hundred ninety-one thousand, forty".