20423144443 has 4 divisors (see below), whose sum is σ = 21994155568. Its totient is φ = 18852133320.

The previous prime is 20423144431. The next prime is 20423144453. The reversal of 20423144443 is 34444132402.

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-20423144443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423144453) 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, 785505543 + ... + 785505568.

It is an arithmetic number, because the mean of its divisors is an integer number (5498538892).

Almost surely, 2^20423144443 is an apocalyptic number.

20423144443 is a deficient number, since it is larger than the sum of its proper divisors (1571011125).

20423144443 is a wasteful number, since it uses less digits than its factorization.

20423144443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571011124.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 20423144443 its reverse (34444132402), we get a palindrome (54867276845).

The spelling of 20423144443 in words is "twenty billion, four hundred twenty-three million, one hundred forty-four thousand, four hundred forty-three".