20403040343 has 4 divisors (see below), whose sum is σ = 23317760400. Its totient is φ = 17488320288.

The previous prime is 20403040309. The next prime is 20403040369. The reversal of 20403040343 is 34304030402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34304030402 = 2 ⋅17152015201.

It is a cyclic number.

It is not a de Polignac number, because 20403040343 - 2¹⁶ = 20402974807 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 (20403040843) 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, 1457360018 + ... + 1457360031.

It is an arithmetic number, because the mean of its divisors is an integer number (5829440100).

Almost surely, 2^20403040343 is an apocalyptic number.

20403040343 is a deficient number, since it is larger than the sum of its proper divisors (2914720057).

20403040343 is an equidigital number, since it uses as much as digits as its factorization.

20403040343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914720056.

The product of its (nonzero) digits is 3456, while the sum is 23.

Adding to 20403040343 its reverse (34304030402), we get a palindrome (54707070745).

The spelling of 20403040343 in words is "twenty billion, four hundred three million, forty thousand, three hundred forty-three".