20404424343 has 4 divisors (see below), whose sum is σ = 27205899128. Its totient is φ = 13602949560.

The previous prime is 20404424333. The next prime is 20404424419. The reversal of 20404424343 is 34342440402.

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

It is not a de Polignac number, because 20404424343 - 2²⁰ = 20403375767 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20404424343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404424333) 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, 3400737388 + ... + 3400737393.

It is an arithmetic number, because the mean of its divisors is an integer number (6801474782).

Almost surely, 2^20404424343 is an apocalyptic number.

20404424343 is a deficient number, since it is larger than the sum of its proper divisors (6801474785).

20404424343 is an equidigital number, since it uses as much as digits as its factorization.

20404424343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801474784.

The product of its (nonzero) digits is 36864, while the sum is 30.

Adding to 20404424343 its reverse (34342440402), we get a palindrome (54746864745).

The spelling of 20404424343 in words is "twenty billion, four hundred four million, four hundred twenty-four thousand, three hundred forty-three".