205450660 has 24 divisors (see below), whose sum is σ = 432021240. Its totient is φ = 82070784.

The previous prime is 205450657. The next prime is 205450669. The reversal of 205450660 is 66054502.

It can be written as a sum of positive squares in 4 ways, for example, as 30206016 + 175244644 = 5496^2 + 13238^2 .

It is not an unprimeable number, because it can be changed into a prime (205450669) 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, 9496 + ... + 22384.

It is an arithmetic number, because the mean of its divisors is an integer number (18000885).

Almost surely, 2^205450660 is an apocalyptic number.

205450660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205450660 is an abundant number, since it is smaller than the sum of its proper divisors (226570580).

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

205450660 is a wasteful number, since it uses less digits than its factorization.

205450660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13695 (or 13693 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 205450660 is about 14333.5501533988. The cubic root of 205450660 is about 590.0686121490.

The spelling of 205450660 in words is "two hundred five million, four hundred fifty thousand, six hundred sixty".