20450340231543 has 24 divisors (see below), whose sum is σ = 31172407297200. Its totient is φ = 12883470297984.

The previous prime is 20450340231533. The next prime is 20450340231571. The reversal of 20450340231543 is 34513204305402.

20450340231543 is a `hidden beast` number, since 2 + 0 + 4 + 50 + 3 + 40 + 23 + 1 + 543 = 666.

It is not a de Polignac number, because 20450340231543 - 2⁸ = 20450340231287 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20450340231498 and 20450340231507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450340231533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150552558 + ... + 150688331.

It is an arithmetic number, because the mean of its divisors is an integer number (1298850304050).

Almost surely, 2^{20450340231543} is an apocalyptic number.

20450340231543 is a deficient number, since it is larger than the sum of its proper divisors (10722067065657).

20450340231543 is a wasteful number, since it uses less digits than its factorization.

20450340231543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301241311 (or 301241308 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 20450340231543 its reverse (34513204305402), we get a palindrome (54963544536945).

The spelling of 20450340231543 in words is "twenty trillion, four hundred fifty billion, three hundred forty million, two hundred thirty-one thousand, five hundred forty-three".