20808045312 has 72 divisors (see below), whose sum is σ = 55537352304. Its totient is φ = 6916276224.

The previous prime is 20808045253. The next prime is 20808045319. The reversal of 20808045312 is 21354080802.

It is not an unprimeable number, because it can be changed into a prime (20808045319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232728 + ... + 309480.

Almost surely, 2^20808045312 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 20808045312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27768676152).

20808045312 is an abundant number, since it is smaller than the sum of its proper divisors (34729306992).

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

20808045312 is an equidigital number, since it uses as much as digits as its factorization.

20808045312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77125 (or 77111 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The spelling of 20808045312 in words is "twenty billion, eight hundred eight million, forty-five thousand, three hundred twelve".