20344789128 has 16 divisors (see below), whose sum is σ = 50861972880. Its totient is φ = 6781596368.

The previous prime is 20344789109. The next prime is 20344789169. The reversal of 20344789128 is 82198744302.

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, 423849750 + ... + 423849797.

It is an arithmetic number, because the mean of its divisors is an integer number (3178873305).

Almost surely, 2^20344789128 is an apocalyptic number.

It is an amenable number.

20344789128 is an abundant number, since it is smaller than the sum of its proper divisors (30517183752).

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

20344789128 is a wasteful number, since it uses less digits than its factorization.

20344789128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847699556 (or 847699552 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 20344789128 in words is "twenty billion, three hundred forty-four million, seven hundred eighty-nine thousand, one hundred twenty-eight".