20605443 has 8 divisors (see below), whose sum is σ = 28920000. Its totient is φ = 13013928.

The previous prime is 20605397. The next prime is 20605463. The reversal of 20605443 is 34450602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20605443 - 2⁹ = 20604931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20605463) 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 7 ways as a sum of consecutive naturals, for example, 180693 + ... + 180806.

It is an arithmetic number, because the mean of its divisors is an integer number (3615000).

Almost surely, 2^20605443 is an apocalyptic number.

20605443 is a deficient number, since it is larger than the sum of its proper divisors (8314557).

20605443 is a wasteful number, since it uses less digits than its factorization.

20605443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361521.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20605443 is about 4539.3218656535. The cubic root of 20605443 is about 274.1536203218.

It can be divided in two parts, 2060 and 5443, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 20605443 in words is "twenty million, six hundred five thousand, four hundred forty-three".