20442442218 has 64 divisors (see below), whose sum is σ = 45550719360. Its totient is φ = 6064256000.

The previous prime is 20442442177. The next prime is 20442442231. The reversal of 20442442218 is 81224424402.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 576046 + ... + 610502.

It is an arithmetic number, because the mean of its divisors is an integer number (711729990).

Almost surely, 2^20442442218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20442442218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22775359680).

20442442218 is an abundant number, since it is smaller than the sum of its proper divisors (25108277142).

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

20442442218 is a wasteful number, since it uses less digits than its factorization.

20442442218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34663.

The product of its (nonzero) digits is 32768, while the sum is 33.

It can be divided in two parts, 204424 and 42218, that added together give a palindrome (246642).

The spelling of 20442442218 in words is "twenty billion, four hundred forty-two million, four hundred forty-two thousand, two hundred eighteen".