20243644 has 12 divisors (see below), whose sum is σ = 35458864. Its totient is φ = 10112544.

The previous prime is 20243623. The next prime is 20243659. The reversal of 20243644 is 44634202.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5569 + ... + 8455.

Almost surely, 2^20243644 is an apocalyptic number.

It is an amenable number.

20243644 is a deficient number, since it is larger than the sum of its proper divisors (15215220).

20243644 is a wasteful number, since it uses less digits than its factorization.

20243644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4644 (or 4642 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 20243644 is about 4499.2937223524. The cubic root of 20243644 is about 272.5395683641.

Adding to 20243644 its reverse (44634202), we get a palindrome (64877846).

The spelling of 20243644 in words is "twenty million, two hundred forty-three thousand, six hundred forty-four".