205099880 has 32 divisors (see below), whose sum is σ = 473950440. Its totient is φ = 79822080.

The previous prime is 205099831. The next prime is 205099891. The reversal of 205099880 is 88990502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 204661636 + 438244 = 14306^2 + 662^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67811 + ... + 70770.

Almost surely, 2^205099880 is an apocalyptic number.

205099880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205099880 is an abundant number, since it is smaller than the sum of its proper divisors (268850560).

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

205099880 is a wasteful number, since it uses less digits than its factorization.

205099880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138629 (or 138625 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 205099880 is about 14321.3085994262. The cubic root of 205099880 is about 589.7325993092.

The spelling of 205099880 in words is "two hundred five million, ninety-nine thousand, eight hundred eighty".