20403558789328 has 80 divisors (see below), whose sum is σ = 46453589030016. Its totient is φ = 8558993963520.

The previous prime is 20403558789253. The next prime is 20403558789329. The reversal of 20403558789328 is 82398785530402.

It is a super-2 number, since 2×20403558789328² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20403558789328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403558789329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9111726 + ... + 11127922.

Almost surely, 2^{20403558789328} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20403558789328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23226794515008).

20403558789328 is an abundant number, since it is smaller than the sum of its proper divisors (26050030240688).

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

20403558789328 is a wasteful number, since it uses less digits than its factorization.

20403558789328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020652 (or 2020646 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 64.

The spelling of 20403558789328 in words is "twenty trillion, four hundred three billion, five hundred fifty-eight million, seven hundred eighty-nine thousand, three hundred twenty-eight".