20445215541044 has 144 divisors (see below), whose sum is σ = 44930013762816. Its totient is φ = 8095881024000.

The previous prime is 20445215540983. The next prime is 20445215541059. The reversal of 20445215541044 is 44014551254402.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 20445215540992 and 20445215541010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18120017 + ... + 19215239.

It is an arithmetic number, because the mean of its divisors is an integer number (312013984464).

Almost surely, 2^{20445215541044} 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 20445215541044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22465006881408).

20445215541044 is an abundant number, since it is smaller than the sum of its proper divisors (24484798221772).

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

20445215541044 is a wasteful number, since it uses less digits than its factorization.

20445215541044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095406 (or 1095397 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 41.

Adding to 20445215541044 its reverse (44014551254402), we get a palindrome (64459766795446).

The spelling of 20445215541044 in words is "twenty trillion, four hundred forty-five billion, two hundred fifteen million, five hundred forty-one thousand, forty-four".