20771730720442 has 16 divisors (see below), whose sum is σ = 33554643020640. Its totient is φ = 9586864417392.

The previous prime is 20771730720397. The next prime is 20771730720569. The reversal of 20771730720442 is 24402703717702.

It is a junction number, because it is equal to n+sod(n) for n = 20771730720392 and 20771730720401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 752392 + ... + 6489187.

It is an arithmetic number, because the mean of its divisors is an integer number (2097165188790).

Almost surely, 2^{20771730720442} is an apocalyptic number.

20771730720442 is a deficient number, since it is larger than the sum of its proper divisors (12782912300198).

20771730720442 is a wasteful number, since it uses less digits than its factorization.

20771730720442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7351917.

The product of its (nonzero) digits is 921984, while the sum is 46.

The spelling of 20771730720442 in words is "twenty trillion, seven hundred seventy-one billion, seven hundred thirty million, seven hundred twenty thousand, four hundred forty-two".