20321331066406 has 24 divisors (see below), whose sum is σ = 32941925147664. Its totient is φ = 9383763053280.

The previous prime is 20321331066349. The next prime is 20321331066433. The reversal of 20321331066406 is 60466013312302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262605825 + ... + 262683196.

It is an arithmetic number, because the mean of its divisors is an integer number (1372580214486).

Almost surely, 2^{20321331066406} is an apocalyptic number.

20321331066406 is a deficient number, since it is larger than the sum of its proper divisors (12620594081258).

20321331066406 is a wasteful number, since it uses less digits than its factorization.

20321331066406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525289104 (or 525289075 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 37.

Adding to 20321331066406 its reverse (60466013312302), we get a palindrome (80787344378708).

The spelling of 20321331066406 in words is "twenty trillion, three hundred twenty-one billion, three hundred thirty-one million, sixty-six thousand, four hundred six".