20440443156 has 24 divisors (see below), whose sum is σ = 54507848640. Its totient is φ = 5840126592.

The previous prime is 20440443139. The next prime is 20440443169. The reversal of 20440443156 is 65134404402.

It is a happy number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 121669221 + ... + 121669388.

It is an arithmetic number, because the mean of its divisors is an integer number (2271160360).

Almost surely, 2^20440443156 is an apocalyptic number.

It is an amenable number.

20440443156 is an abundant number, since it is smaller than the sum of its proper divisors (34067405484).

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

20440443156 is a wasteful number, since it uses less digits than its factorization.

20440443156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243338623 (or 243338621 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

Adding to 20440443156 its reverse (65134404402), we get a palindrome (85574847558).

The spelling of 20440443156 in words is "twenty billion, four hundred forty million, four hundred forty-three thousand, one hundred fifty-six".