20385856708 has 72 divisors (see below), whose sum is σ = 43372615104. Its totient is φ = 8343720000.

The previous prime is 20385856681. The next prime is 20385856723. The reversal of 20385856708 is 80765858302.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3156883 + ... + 3163333.

It is an arithmetic number, because the mean of its divisors is an integer number (602397432).

Almost surely, 2^20385856708 is an apocalyptic number.

20385856708 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 20385856708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21686307552).

20385856708 is an abundant number, since it is smaller than the sum of its proper divisors (22986758396).

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

20385856708 is a wasteful number, since it uses less digits than its factorization.

20385856708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7193 (or 7184 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 20385856708 in words is "twenty billion, three hundred eighty-five million, eight hundred fifty-six thousand, seven hundred eight".