20309752008 has 384 divisors, whose sum is σ = 71034163200. Its totient is φ = 5095208448.

The previous prime is 20309752007. The next prime is 20309752037. The reversal of 20309752008 is 80025790302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20309752007) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 46263453 + ... + 46263891.

It is an arithmetic number, because the mean of its divisors is an integer number (184984800).

Almost surely, 2^20309752008 is an apocalyptic number.

20309752008 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 20309752008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35517081600).

20309752008 is an abundant number, since it is smaller than the sum of its proper divisors (50724411192).

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

20309752008 is a wasteful number, since it uses less digits than its factorization.

20309752008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 20309752008 in words is "twenty billion, three hundred nine million, seven hundred fifty-two thousand, eight".