20445443844 has 48 divisors (see below), whose sum is σ = 55633872000. Its totient is φ = 5841554208.

The previous prime is 20445443833. The next prime is 20445443899. The reversal of 20445443844 is 44834454402.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 20445443796 and 20445443805.

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, 2479539 + ... + 2487770.

It is an arithmetic number, because the mean of its divisors is an integer number (1159039000).

Almost surely, 2^20445443844 is an apocalyptic number.

It is an amenable number.

20445443844 is an abundant number, since it is smaller than the sum of its proper divisors (35188428156).

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

20445443844 is a wasteful number, since it uses less digits than its factorization.

20445443844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4967337 (or 4967321 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 42.

The spelling of 20445443844 in words is "twenty billion, four hundred forty-five million, four hundred forty-three thousand, eight hundred forty-four".