20218688899 has 8 divisors (see below), whose sum is σ = 21302324240. Its totient is φ = 19137002976.

The previous prime is 20218688891. The next prime is 20218688929. The reversal of 20218688899 is 99888681202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20218688899 - 2³ = 20218688891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20218688891) 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, 466032 + ... + 507565.

It is an arithmetic number, because the mean of its divisors is an integer number (2662790530).

Almost surely, 2^20218688899 is an apocalyptic number.

20218688899 is a deficient number, since it is larger than the sum of its proper divisors (1083635341).

20218688899 is a wasteful number, since it uses less digits than its factorization.

20218688899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974709.

The product of its (nonzero) digits is 7962624, while the sum is 61.

The spelling of 20218688899 in words is "twenty billion, two hundred eighteen million, six hundred eighty-eight thousand, eight hundred ninety-nine".