20550442112 has 64 divisors (see below), whose sum is σ = 43489405440. Its totient is φ = 9639383040.

The previous prime is 20550442091. The next prime is 20550442117. The reversal of 20550442112 is 21124405502.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (20550442117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661553 + ... + 691919.

It is an arithmetic number, because the mean of its divisors is an integer number (679521960).

Almost surely, 2^20550442112 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 20550442112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21744702720).

20550442112 is an abundant number, since it is smaller than the sum of its proper divisors (22938963328).

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

20550442112 is a wasteful number, since it uses less digits than its factorization.

20550442112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30709 (or 30697 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 20550442112 its reverse (21124405502), we get a palindrome (41674847614).

The spelling of 20550442112 in words is "twenty billion, five hundred fifty million, four hundred forty-two thousand, one hundred twelve".