20344134453543 has 48 divisors (see below), whose sum is σ = 29723423479360. Its totient is φ = 13407494284800.

The previous prime is 20344134453523. The next prime is 20344134453547. The reversal of 20344134453543 is 34535443144302.

20344134453543 is a `hidden beast` number, since 2 + 0 + 3 + 4 + 4 + 13 + 44 + 53 + 543 = 666.

It is not a de Polignac number, because 20344134453543 - 2⁹ = 20344134453031 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 (20344134453547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1309054353 + ... + 1309069893.

Almost surely, 2^{20344134453543} is an apocalyptic number.

20344134453543 is a deficient number, since it is larger than the sum of its proper divisors (9379289025817).

20344134453543 is a wasteful number, since it uses less digits than its factorization.

20344134453543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18040 (or 18037 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 45.

Adding to 20344134453543 its reverse (34535443144302), we get a palindrome (54879577597845).

The spelling of 20344134453543 in words is "twenty trillion, three hundred forty-four billion, one hundred thirty-four million, four hundred fifty-three thousand, five hundred forty-three".