20216563648 has 28 divisors (see below), whose sum is σ = 40600594440. Its totient is φ = 9986492672.

The previous prime is 20216563613. The next prime is 20216563669. The reversal of 20216563648 is 84636561202.

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, 1897603 + ... + 1908226.

It is an arithmetic number, because the mean of its divisors is an integer number (1450021230).

Almost surely, 2^20216563648 is an apocalyptic number.

It is an amenable number.

20216563648 is an abundant number, since it is smaller than the sum of its proper divisors (20384030792).

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

20216563648 is an equidigital number, since it uses as much as digits as its factorization.

20216563648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805924 (or 3805914 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 20216563648 in words is "twenty billion, two hundred sixteen million, five hundred sixty-three thousand, six hundred forty-eight".