205068640 has 96 divisors (see below), whose sum is σ = 556524864. Its totient is φ = 69949440.

The previous prime is 205068581. The next prime is 205068673. The reversal of 205068640 is 46860502.

It is a super-2 number, since 2×205068640² = 84106294222899200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309910 + ... + 310570.

It is an arithmetic number, because the mean of its divisors is an integer number (5797134).

Almost surely, 2^205068640 is an apocalyptic number.

205068640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205068640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278262432).

205068640 is an abundant number, since it is smaller than the sum of its proper divisors (351456224).

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

205068640 is a wasteful number, since it uses less digits than its factorization.

205068640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 205068640 is about 14320.2178754375. The cubic root of 205068640 is about 589.7026558789.

The spelling of 205068640 in words is "two hundred five million, sixty-eight thousand, six hundred forty".