20352644 has 12 divisors (see below), whose sum is σ = 38357004. Its totient is φ = 9393504.

The previous prime is 20352643. The next prime is 20352649. The reversal of 20352644 is 44625302.

It can be written as a sum of positive squares in 2 ways, for example, as 3378244 + 16974400 = 1838^2 + 4120^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (20352643) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 195647 + ... + 195750.

It is an arithmetic number, because the mean of its divisors is an integer number (3196417).

Almost surely, 2^20352644 is an apocalyptic number.

It is an amenable number.

20352644 is a deficient number, since it is larger than the sum of its proper divisors (18004360).

20352644 is a wasteful number, since it uses less digits than its factorization.

20352644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391414 (or 391412 counting only the distinct ones).

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

The square root of 20352644 is about 4511.3904730138. The cubic root of 20352644 is about 273.0278476157.

Adding to 20352644 its reverse (44625302), we get a palindrome (64977946).

The spelling of 20352644 in words is "twenty million, three hundred fifty-two thousand, six hundred forty-four".