20918470688 has 24 divisors (see below), whose sum is σ = 41435907408. Its totient is φ = 10395065664.

The previous prime is 20918470673. The next prime is 20918470691. The reversal of 20918470688 is 88607481902.

It is a happy 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, 2000006 + ... + 2010437.

It is an arithmetic number, because the mean of its divisors is an integer number (1726496142).

Almost surely, 2^20918470688 is an apocalyptic number.

It is an amenable number.

20918470688 is a deficient number, since it is larger than the sum of its proper divisors (20517436720).

20918470688 is a wasteful number, since it uses less digits than its factorization.

20918470688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010616 (or 4010608 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 20918470688 in words is "twenty billion, nine hundred eighteen million, four hundred seventy thousand, six hundred eighty-eight".