20016443 has 4 divisors (see below), whose sum is σ = 21069960. Its totient is φ = 18962928.

The previous prime is 20016439. The next prime is 20016461. The reversal of 20016443 is 34461002.

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: 34461002 = 2 ⋅17230501.

It is a cyclic number.

It is not a de Polignac number, because 20016443 - 2² = 20016439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20016413) 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, 526730 + ... + 526767.

It is an arithmetic number, because the mean of its divisors is an integer number (5267490).

Almost surely, 2^20016443 is an apocalyptic number.

20016443 is a deficient number, since it is larger than the sum of its proper divisors (1053517).

20016443 is a wasteful number, since it uses less digits than its factorization.

20016443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053516.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20016443 is about 4473.9739605858. The cubic root of 20016443 is about 271.5161298974.

Adding to 20016443 its reverse (34461002), we get a palindrome (54477445).

The spelling of 20016443 in words is "twenty million, sixteen thousand, four hundred forty-three".