20730443 has 4 divisors (see below), whose sum is σ = 20759088. Its totient is φ = 20701800.

The previous prime is 20730439. The next prime is 20730481. The reversal of 20730443 is 34403702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34403702 = 2 ⋅17201851.

It is a cyclic number.

It is not a de Polignac number, because 20730443 - 2² = 20730439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20730433) 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, 13208 + ... + 14693.

It is an arithmetic number, because the mean of its divisors is an integer number (5189772).

Almost surely, 2^20730443 is an apocalyptic number.

20730443 is a deficient number, since it is larger than the sum of its proper divisors (28645).

20730443 is an equidigital number, since it uses as much as digits as its factorization.

20730443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28644.

The product of its (nonzero) digits is 2016, while the sum is 23.

The square root of 20730443 is about 4553.0696238911. The cubic root of 20730443 is about 274.7068744421.

The spelling of 20730443 in words is "twenty million, seven hundred thirty thousand, four hundred forty-three".