20289444 has 48 divisors (see below), whose sum is σ = 55977600. Its totient is φ = 5596416.

The previous prime is 20289439. The next prime is 20289463. The reversal of 20289444 is 44498202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1729 + ... + 6600.

It is an arithmetic number, because the mean of its divisors is an integer number (1166200).

Almost surely, 2^20289444 is an apocalyptic number.

It is an amenable number.

20289444 is an abundant number, since it is smaller than the sum of its proper divisors (35688156).

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

20289444 is a wasteful number, since it uses less digits than its factorization.

20289444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8372 (or 8370 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 20289444 is about 4504.3805345463. The cubic root of 20289444 is about 272.7449482282.

The spelling of 20289444 in words is "twenty million, two hundred eighty-nine thousand, four hundred forty-four".