20685556763 has 16 divisors (see below), whose sum is σ = 21505720320. Its totient is φ = 19881936000.

The previous prime is 20685556753. The next prime is 20685556807. The reversal of 20685556763 is 36765558602.

It is a cyclic number.

It is not a de Polignac number, because 20685556763 - 2¹⁰ = 20685555739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20685556753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3188483 + ... + 3194963.

It is an arithmetic number, because the mean of its divisors is an integer number (1344107520).

Almost surely, 2^20685556763 is an apocalyptic number.

20685556763 is a deficient number, since it is larger than the sum of its proper divisors (820163557).

20685556763 is a wasteful number, since it uses less digits than its factorization.

20685556763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7738.

The product of its (nonzero) digits is 9072000, while the sum is 53.

The spelling of 20685556763 in words is "twenty billion, six hundred eighty-five million, five hundred fifty-six thousand, seven hundred sixty-three".