20479428816 has 320 divisors, whose sum is σ = 69554405376. Its totient is φ = 5036889600.

The previous prime is 20479428799. The next prime is 20479428857. The reversal of 20479428816 is 61882497402.

It is a super-2 number, since 2×20479428816² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5383171 + ... + 5386973.

Almost surely, 2^20479428816 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 20479428816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34777202688).

20479428816 is an abundant number, since it is smaller than the sum of its proper divisors (49074976560).

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

20479428816 is a wasteful number, since it uses less digits than its factorization.

20479428816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910 (or 3904 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 20479428816 in words is "twenty billion, four hundred seventy-nine million, four hundred twenty-eight thousand, eight hundred sixteen".