20531322444 has 96 divisors (see below), whose sum is σ = 52025702400. Its totient is φ = 6286049280.

The previous prime is 20531322443. The next prime is 20531322463. The reversal of 20531322444 is 44422313502.

It is not an unprimeable number, because it can be changed into a prime (20531322443) 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 31 ways as a sum of consecutive naturals, for example, 620364 + ... + 652620.

It is an arithmetic number, because the mean of its divisors is an integer number (541934400).

Almost surely, 2^20531322444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531322444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26012851200).

20531322444 is an abundant number, since it is smaller than the sum of its proper divisors (31494379956).

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

20531322444 is a wasteful number, since it uses less digits than its factorization.

20531322444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32383 (or 32381 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 20531322444 its reverse (44422313502), we get a palindrome (64953635946).

The spelling of 20531322444 in words is "twenty billion, five hundred thirty-one million, three hundred twenty-two thousand, four hundred forty-four".