20345884308 has 36 divisors (see below), whose sum is σ = 54455162580. Its totient is φ = 6383022336.

The previous prime is 20345884289. The next prime is 20345884309. The reversal of 20345884308 is 80348854302.

20345884308 is a `hidden beast` number, since 2 + 0 + 34 + 588 + 4 + 30 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9241361424 + 11104522884 = 96132^2 + 105378^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345884309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16621843 + ... + 16623066.

It is an arithmetic number, because the mean of its divisors is an integer number (1512643405).

Almost surely, 2^20345884308 is an apocalyptic number.

It is an amenable number.

20345884308 is an abundant number, since it is smaller than the sum of its proper divisors (34109278272).

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

20345884308 is a wasteful number, since it uses less digits than its factorization.

20345884308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33244936 (or 33244931 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 20345884308 in words is "twenty billion, three hundred forty-five million, eight hundred eighty-four thousand, three hundred eight".