20321056660040 has 64 divisors (see below), whose sum is σ = 48412754956800. Its totient is φ = 7650149649408.

The previous prime is 20321056660039. The next prime is 20321056660061. The reversal of 20321056660040 is 4006665012302.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 45732617 + ... + 46174823.

It is an arithmetic number, because the mean of its divisors is an integer number (756449296200).

Almost surely, 2^{20321056660040} is an apocalyptic number.

20321056660040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321056660040 is an abundant number, since it is smaller than the sum of its proper divisors (28091698296760).

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

20321056660040 is a wasteful number, since it uses less digits than its factorization.

20321056660040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509814 (or 509810 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 20321056660040 in words is "twenty trillion, three hundred twenty-one billion, fifty-six million, six hundred sixty thousand, forty".