20643816048 has 40 divisors (see below), whose sum is σ = 53446610448. Its totient is φ = 6866207232.

The previous prime is 20643816047. The next prime is 20643816071. The reversal of 20643816048 is 84061834602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643816041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448611 + ... + 492482.

Almost surely, 2^20643816048 is an apocalyptic number.

It is an amenable number.

20643816048 is an abundant number, since it is smaller than the sum of its proper divisors (32802794400).

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

20643816048 is a wasteful number, since it uses less digits than its factorization.

20643816048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941561 (or 941555 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 20643816048 in words is "twenty billion, six hundred forty-three million, eight hundred sixteen thousand, forty-eight".