20643584032 has 12 divisors (see below), whose sum is σ = 40642056126. Its totient is φ = 10321792000.

The previous prime is 20643584029. The next prime is 20643584047. The reversal of 20643584032 is 23048534602.

It can be written as a sum of positive squares in only one way, i.e., 17826522256 + 2817061776 = 133516^2 + 53076^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20643583982 and 20643584000.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 322555969 + ... + 322556032.

Almost surely, 2^20643584032 is an apocalyptic number.

It is an amenable number.

20643584032 is a deficient number, since it is larger than the sum of its proper divisors (19998472094).

20643584032 is an equidigital number, since it uses as much as digits as its factorization.

20643584032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645112011 (or 645112003 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 20643584032 in words is "twenty billion, six hundred forty-three million, five hundred eighty-four thousand, thirty-two".