20490444 has 36 divisors (see below), whose sum is σ = 55780816. Its totient is φ = 6304608.

The previous prime is 20490439. The next prime is 20490451. The reversal of 20490444 is 44409402.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 21424 + ... + 22359.

Almost surely, 2^20490444 is an apocalyptic number.

It is an amenable number.

20490444 is an abundant number, since it is smaller than the sum of its proper divisors (35290372).

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

20490444 is a wasteful number, since it uses less digits than its factorization.

20490444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43806 (or 43801 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20490444 is about 4526.6371623977. The cubic root of 20490444 is about 273.6426513481.

Adding to 20490444 its reverse (44409402), we get a palindrome (64899846).

The spelling of 20490444 in words is "twenty million, four hundred ninety thousand, four hundred forty-four".