20390244 has 48 divisors (see below), whose sum is σ = 55200768. Its totient is φ = 5737248.

The previous prime is 20390239. The next prime is 20390261. The reversal of 20390244 is 44209302.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 3817 + ... + 7439.

It is an arithmetic number, because the mean of its divisors is an integer number (1150016).

Almost surely, 2^20390244 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 20390244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27600384).

20390244 is an abundant number, since it is smaller than the sum of its proper divisors (34810524).

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

20390244 is a wasteful number, since it uses less digits than its factorization.

20390244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3704 (or 3702 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20390244 is about 4515.5557797463. Note that the first 3 decimals coincide. The cubic root of 20390244 is about 273.1958770824.

Adding to 20390244 its reverse (44209302), we get a palindrome (64599546).

The spelling of 20390244 in words is "twenty million, three hundred ninety thousand, two hundred forty-four".