205321026556240 has 120 divisors (see below), whose sum is σ = 567124670126592. Its totient is φ = 68897997907200.

The previous prime is 205321026556223. The next prime is 205321026556267. The reversal of 205321026556240 is 42655620123502.

It is a super-2 number, since 2×205321026556240² (a number of 29 digits) 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 (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 557026536 + ... + 557395015.

Almost surely, 2^{205321026556240} is an apocalyptic number.

205321026556240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205321026556240 is an abundant number, since it is smaller than the sum of its proper divisors (361803643570352).

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

205321026556240 is a wasteful number, since it uses less digits than its factorization.

205321026556240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114421625 (or 1114421612 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

Adding to 205321026556240 its reverse (42655620123502), we get a palindrome (247976646679742).

The spelling of 205321026556240 in words is "two hundred five trillion, three hundred twenty-one billion, twenty-six million, five hundred fifty-six thousand, two hundred forty".