205455660 has 24 divisors (see below), whose sum is σ = 575276016. Its totient is φ = 54788160.

The previous prime is 205455643. The next prime is 205455661. The reversal of 205455660 is 66554502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (205455661) 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, 1712071 + ... + 1712190.

It is an arithmetic number, because the mean of its divisors is an integer number (23969834).

Almost surely, 2^205455660 is an apocalyptic number.

205455660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205455660 is an abundant number, since it is smaller than the sum of its proper divisors (369820356).

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

205455660 is a wasteful number, since it uses less digits than its factorization.

205455660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424273 (or 3424271 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 205455660 is about 14333.7245683039. The cubic root of 205455660 is about 590.0733988930.

The spelling of 205455660 in words is "two hundred five million, four hundred fifty-five thousand, six hundred sixty".