20047648668 has 12 divisors (see below), whose sum is σ = 46777846920. Its totient is φ = 6682549552.

The previous prime is 20047648651. The next prime is 20047648693. The reversal of 20047648668 is 86684674002.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20047648668.

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, 835318683 + ... + 835318706.

It is an arithmetic number, because the mean of its divisors is an integer number (3898153910).

Almost surely, 2^20047648668 is an apocalyptic number.

It is an amenable number.

20047648668 is an abundant number, since it is smaller than the sum of its proper divisors (26730198252).

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

20047648668 is a wasteful number, since it uses less digits than its factorization.

20047648668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670637396 (or 1670637394 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 20047648668 in words is "twenty billion, forty-seven million, six hundred forty-eight thousand, six hundred sixty-eight".