20571109008 has 40 divisors (see below), whose sum is σ = 53159618400. Its totient is φ = 6854767104.

The previous prime is 20571109007. The next prime is 20571109019. The reversal of 20571109008 is 80090117502.

It is a self number, because there is not a number n which added to its sum of digits gives 20571109008.

It is not an unprimeable number, because it can be changed into a prime (20571109007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78903 + ... + 217641.

It is an arithmetic number, because the mean of its divisors is an integer number (1328990460).

Almost surely, 2^20571109008 is an apocalyptic number.

It is an amenable number.

20571109008 is an abundant number, since it is smaller than the sum of its proper divisors (32588509392).

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

20571109008 is a wasteful number, since it uses less digits than its factorization.

20571109008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141839 (or 141833 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The spelling of 20571109008 in words is "twenty billion, five hundred seventy-one million, one hundred nine thousand, eight".