20320111232 has 16 divisors (see below), whose sum is σ = 40481471850. Its totient is φ = 10160055552.

The previous prime is 20320111187. The next prime is 20320111249. The reversal of 20320111232 is 23211102302.

It can be written as a sum of positive squares in only one way, i.e., 18698921536 + 1621189696 = 136744^2 + 40264^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 20320111232.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79375307 + ... + 79375562.

Almost surely, 2^20320111232 is an apocalyptic number.

It is an amenable number.

20320111232 is a deficient number, since it is larger than the sum of its proper divisors (20161360618).

20320111232 is an equidigital number, since it uses as much as digits as its factorization.

20320111232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158750883 (or 158750871 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20320111232 its reverse (23211102302), we get a palindrome (43531213534).

The spelling of 20320111232 in words is "twenty billion, three hundred twenty million, one hundred eleven thousand, two hundred thirty-two".