20443128636 has 48 divisors (see below), whose sum is σ = 54526477824. Its totient is φ = 5839665216.

The previous prime is 20443128623. The next prime is 20443128637. The reversal of 20443128636 is 63682134402.

It is a junction number, because it is equal to n+sod(n) for n = 20443128594 and 20443128603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443128637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422506 + ... + 468398.

It is an arithmetic number, because the mean of its divisors is an integer number (1135968288).

Almost surely, 2^20443128636 is an apocalyptic number.

It is an amenable number.

20443128636 is an abundant number, since it is smaller than the sum of its proper divisors (34083349188).

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

20443128636 is a wasteful number, since it uses less digits than its factorization.

20443128636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51210 (or 51208 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 20443128636 in words is "twenty billion, four hundred forty-three million, one hundred twenty-eight thousand, six hundred thirty-six".