20402040443 has 4 divisors (see below), whose sum is σ = 20402378160. Its totient is φ = 20401702728.

The previous prime is 20402040437. The next prime is 20402040467. The reversal of 20402040443 is 34404020402.

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-20402040443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402040403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50663 + ... + 208256.

It is an arithmetic number, because the mean of its divisors is an integer number (5100594540).

Almost surely, 2^20402040443 is an apocalyptic number.

20402040443 is a deficient number, since it is larger than the sum of its proper divisors (337717).

20402040443 is an equidigital number, since it uses as much as digits as its factorization.

20402040443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337716.

The product of its (nonzero) digits is 3072, while the sum is 23.

Adding to 20402040443 its reverse (34404020402), we get a palindrome (54806060845).

The spelling of 20402040443 in words is "twenty billion, four hundred two million, forty thousand, four hundred forty-three".