20660443 has 8 divisors (see below), whose sum is σ = 21268800. Its totient is φ = 20060808.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660443 is 34406602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20660443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20660473) 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, 2788 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (2658600).

Almost surely, 2^20660443 is an apocalyptic number.

20660443 is a deficient number, since it is larger than the sum of its proper divisors (608357).

20660443 is an equidigital number, since it uses as much as digits as its factorization.

20660443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4361.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20660443 is about 4545.3760020487. The cubic root of 20660443 is about 274.3973270160.

The spelling of 20660443 in words is "twenty million, six hundred sixty thousand, four hundred forty-three".