20429504928 has 864 divisors, whose sum is σ = 76796149248. Its totient is φ = 5109350400.

The previous prime is 20429504873. The next prime is 20429504947. The reversal of 20429504928 is 82940592402.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 304917951 + ... + 304918017.

It is an arithmetic number, because the mean of its divisors is an integer number (88884432).

Almost surely, 2^20429504928 is an apocalyptic number.

20429504928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20429504928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38398074624).

20429504928 is an abundant number, since it is smaller than the sum of its proper divisors (56366644320).

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

20429504928 is a wasteful number, since it uses less digits than its factorization.

20429504928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 20429504928 in words is "twenty billion, four hundred twenty-nine million, five hundred four thousand, nine hundred twenty-eight".