20689663833 has 48 divisors (see below), whose sum is σ = 31913107200. Its totient is φ = 12871457280.

The previous prime is 20689663829. The next prime is 20689663859. The reversal of 20689663833 is 33836698602.

It is not a de Polignac number, because 20689663833 - 2² = 20689663829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20689663833.

It is not an unprimeable number, because it can be changed into a prime (20689663873) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9493938 + ... + 9496116.

It is an arithmetic number, because the mean of its divisors is an integer number (664856400).

Almost surely, 2^20689663833 is an apocalyptic number.

It is an amenable number.

20689663833 is a deficient number, since it is larger than the sum of its proper divisors (11223443367).

20689663833 is a wasteful number, since it uses less digits than its factorization.

20689663833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702 (or 2699 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 20689663833 in words is "twenty billion, six hundred eighty-nine million, six hundred sixty-three thousand, eight hundred thirty-three".