20011989448 has 32 divisors (see below), whose sum is σ = 41004660960. Its totient is φ = 9080570880.

The previous prime is 20011989443. The next prime is 20011989451. The reversal of 20011989448 is 84498911002.

It is a junction number, because it is equal to n+sod(n) for n = 20011989398 and 20011989407.

It is not an unprimeable number, because it can be changed into a prime (20011989443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146286 + ... + 247837.

It is an arithmetic number, because the mean of its divisors is an integer number (1281395655).

Almost surely, 2^20011989448 is an apocalyptic number.

It is an amenable number.

20011989448 is an abundant number, since it is smaller than the sum of its proper divisors (20992671512).

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

20011989448 is a wasteful number, since it uses less digits than its factorization.

20011989448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394717 (or 394713 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 20011989448 in words is "twenty billion, eleven million, nine hundred eighty-nine thousand, four hundred forty-eight".