20648845628 has 12 divisors (see below), whose sum is σ = 36165278520. Its totient is φ = 10315908912.

The previous prime is 20648845619. The next prime is 20648845667. The reversal of 20648845628 is 82654884602.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20648845628.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123018 + ... + 2132721.

It is an arithmetic number, because the mean of its divisors is an integer number (3013773210).

Almost surely, 2^20648845628 is an apocalyptic number.

It is an amenable number.

20648845628 is a deficient number, since it is larger than the sum of its proper divisors (15516432892).

20648845628 is a wasteful number, since it uses less digits than its factorization.

20648845628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256956 (or 4256954 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 53.

The spelling of 20648845628 in words is "twenty billion, six hundred forty-eight million, eight hundred forty-five thousand, six hundred twenty-eight".