20001243443 has 4 divisors (see below), whose sum is σ = 20003699448. Its totient is φ = 19998787440.

The previous prime is 20001243391. The next prime is 20001243473. The reversal of 20001243443 is 34434210002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001243443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001243473) 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, 1215746 + ... + 1232087.

It is an arithmetic number, because the mean of its divisors is an integer number (5000924862).

Almost surely, 2^20001243443 is an apocalyptic number.

20001243443 is a deficient number, since it is larger than the sum of its proper divisors (2456005).

20001243443 is an equidigital number, since it uses as much as digits as its factorization.

20001243443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456004.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20001243443 its reverse (34434210002), we get a palindrome (54435453445).

The spelling of 20001243443 in words is "twenty billion, one million, two hundred forty-three thousand, four hundred forty-three".