20329865608 has 64 divisors (see below), whose sum is σ = 41838975360. Its totient is φ = 9204558336.

The previous prime is 20329865603. The next prime is 20329865641. The reversal of 20329865608 is 80656892302.

It is not an unprimeable number, because it can be changed into a prime (20329865603) 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, 1137316 + ... + 1155052.

It is an arithmetic number, because the mean of its divisors is an integer number (653733990).

Almost surely, 2^20329865608 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 20329865608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20919487680).

20329865608 is an abundant number, since it is smaller than the sum of its proper divisors (21509109752).

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

20329865608 is a wasteful number, since it uses less digits than its factorization.

20329865608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17966 (or 17962 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 20329865608 in words is "twenty billion, three hundred twenty-nine million, eight hundred sixty-five thousand, six hundred eight".