20321244 has 72 divisors (see below), whose sum is σ = 53813760. Its totient is φ = 6458400.

The previous prime is 20321243. The next prime is 20321261. The reversal of 20321244 is 44212302.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321243) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 146127 + ... + 146265.

Almost surely, 2^20321244 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 20321244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26906880).

20321244 is an abundant number, since it is smaller than the sum of its proper divisors (33492516).

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

20321244 is a wasteful number, since it uses less digits than its factorization.

20321244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20321244 is about 4507.9090496593. The cubic root of 20321244 is about 272.8873664897.

Adding to 20321244 its reverse (44212302), we get a palindrome (64533546).

The spelling of 20321244 in words is "twenty million, three hundred twenty-one thousand, two hundred forty-four".