20443688 has 32 divisors (see below), whose sum is σ = 40340160. Its totient is φ = 9694080.

The previous prime is 20443681. The next prime is 20443691. The reversal of 20443688 is 88634402.

It is not an unprimeable number, because it can be changed into a prime (20443681) 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 7 ways as a sum of consecutive naturals, for example, 24803 + ... + 25613.

It is an arithmetic number, because the mean of its divisors is an integer number (1260630).

Almost surely, 2^20443688 is an apocalyptic number.

It is an amenable number.

20443688 is a deficient number, since it is larger than the sum of its proper divisors (19896472).

20443688 is a wasteful number, since it uses less digits than its factorization.

20443688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 20443688 is about 4521.4696725733. The cubic root of 20443688 is about 273.4343562066.

The spelling of 20443688 in words is "twenty million, four hundred forty-three thousand, six hundred eighty-eight".