20020440144 has 80 divisors (see below), whose sum is σ = 54495956480. Its totient is φ = 6315926400.

The previous prime is 20020440107. The next prime is 20020440151. The reversal of 20020440144 is 44104402002.

It is a self number, because there is not a number n which added to its sum of digits gives 20020440144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 948069 + ... + 968955.

It is an arithmetic number, because the mean of its divisors is an integer number (681199456).

Almost surely, 2^20020440144 is an apocalyptic number.

20020440144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20020440144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27247978240).

20020440144 is an abundant number, since it is smaller than the sum of its proper divisors (34475516336).

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

20020440144 is a wasteful number, since it uses less digits than its factorization.

20020440144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21968 (or 21962 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 20020440144 its reverse (44104402002), we get a palindrome (64124842146).

The spelling of 20020440144 in words is "twenty billion, twenty million, four hundred forty thousand, one hundred forty-four".