20397418343 has 4 divisors (see below), whose sum is σ = 20400137208. Its totient is φ = 20394699480.

The previous prime is 20397418331. The next prime is 20397418367. The reversal of 20397418343 is 34381479302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34381479302 = 2 ⋅17190739651.

It is a cyclic number.

It is not a de Polignac number, because 20397418343 - 2⁸ = 20397418087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20397418294 and 20397418303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20397418373) 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, 1348148 + ... + 1363193.

It is an arithmetic number, because the mean of its divisors is an integer number (5100034302).

Almost surely, 2^20397418343 is an apocalyptic number.

20397418343 is a deficient number, since it is larger than the sum of its proper divisors (2718865).

20397418343 is an equidigital number, since it uses as much as digits as its factorization.

20397418343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718864.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 20397418343 in words is "twenty billion, three hundred ninety-seven million, four hundred eighteen thousand, three hundred forty-three".