20665043 has 4 divisors (see below), whose sum is σ = 23617200. Its totient is φ = 17712888.

The previous prime is 20665039. The next prime is 20665067. The reversal of 20665043 is 34056602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20665043 - 2² = 20665039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20665033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1476068 + ... + 1476081.

It is an arithmetic number, because the mean of its divisors is an integer number (5904300).

Almost surely, 2^20665043 is an apocalyptic number.

20665043 is a deficient number, since it is larger than the sum of its proper divisors (2952157).

20665043 is an equidigital number, since it uses as much as digits as its factorization.

20665043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952156.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 20665043 is about 4545.8819826300. The cubic root of 20665043 is about 274.4176901489.

The spelling of 20665043 in words is "twenty million, six hundred sixty-five thousand, forty-three".