20400144343 has 4 divisors (see below), whose sum is σ = 20407894848. Its totient is φ = 20392393840.

The previous prime is 20400144319. The next prime is 20400144353. The reversal of 20400144343 is 34344100402.

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

It is a cyclic number.

It is not a de Polignac number, because 20400144343 - 2⁵ = 20400144311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400144353) 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, 3871303 + ... + 3876568.

It is an arithmetic number, because the mean of its divisors is an integer number (5101973712).

Almost surely, 2^20400144343 is an apocalyptic number.

20400144343 is a deficient number, since it is larger than the sum of its proper divisors (7750505).

20400144343 is an equidigital number, since it uses as much as digits as its factorization.

20400144343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7750504.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20400144343 its reverse (34344100402), we get a palindrome (54744244745).

The spelling of 20400144343 in words is "twenty billion, four hundred million, one hundred forty-four thousand, three hundred forty-three".