20105444 has 12 divisors (see below), whose sum is σ = 35848764. Its totient is φ = 9862944.

The previous prime is 20105443. The next prime is 20105447. The reversal of 20105444 is 44450102.

It can be written as a sum of positive squares in 2 ways, for example, as 11764900 + 8340544 = 3430^2 + 2888^2 .

It is not an unprimeable number, because it can be changed into a prime (20105443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47207 + ... + 47630.

It is an arithmetic number, because the mean of its divisors is an integer number (2987397).

Almost surely, 2^20105444 is an apocalyptic number.

It is an amenable number.

20105444 is a deficient number, since it is larger than the sum of its proper divisors (15743320).

20105444 is a wasteful number, since it uses less digits than its factorization.

20105444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94894 (or 94892 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20105444 is about 4483.9094549288. The cubic root of 20105444 is about 271.9179575227.

Adding to 20105444 its reverse (44450102), we get a palindrome (64555546).

The spelling of 20105444 in words is "twenty million, one hundred five thousand, four hundred forty-four".