20129389056 has 480 divisors, whose sum is σ = 71316685440. Its totient is φ = 5545967616.

The previous prime is 20129389009. The next prime is 20129389099. The reversal of 20129389056 is 65098392102.

It is a super-2 number, since 2×20129389056² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25256050 + ... + 25256846.

It is an arithmetic number, because the mean of its divisors is an integer number (148576428).

Almost surely, 2^20129389056 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 20129389056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35658342720).

20129389056 is an abundant number, since it is smaller than the sum of its proper divisors (51187296384).

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

20129389056 is an frugal number, since it uses more digits than its factorization.

20129389056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 20129389056 in words is "twenty billion, one hundred twenty-nine million, three hundred eighty-nine thousand, fifty-six".