20644352 has 40 divisors (see below), whose sum is σ = 41988012. Its totient is φ = 10137600.

The previous prime is 20644333. The next prime is 20644367. The reversal of 20644352 is 25344602.

It can be written as a sum of positive squares in 2 ways, for example, as 20214016 + 430336 = 4496^2 + 656^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30902 + ... + 31562.

Almost surely, 2^20644352 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 20644352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20994006).

20644352 is an abundant number, since it is smaller than the sum of its proper divisors (21343660).

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

20644352 is an frugal number, since it uses more digits than its factorization.

20644352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20644352 is about 4543.6056166881. The cubic root of 20644352 is about 274.3260721039.

Adding to 20644352 its reverse (25344602), we get a palindrome (45988954).

The spelling of 20644352 in words is "twenty million, six hundred forty-four thousand, three hundred fifty-two".