20307529188 has 36 divisors (see below), whose sum is σ = 51338277900. Its totient is φ = 6768470016.

The previous prime is 20307529171. The next prime is 20307529223. The reversal of 20307529188 is 88192570302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14621162724 + 5686366464 = 120918^2 + 75408^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410356 + ... + 457172.

It is an arithmetic number, because the mean of its divisors is an integer number (1426063275).

Almost surely, 2^20307529188 is an apocalyptic number.

It is an amenable number.

20307529188 is an abundant number, since it is smaller than the sum of its proper divisors (31030748712).

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

20307529188 is a wasteful number, since it uses less digits than its factorization.

20307529188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58876 (or 58871 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 20307529188 in words is "twenty billion, three hundred seven million, five hundred twenty-nine thousand, one hundred eighty-eight".