20505041220543 has 12 divisors (see below), whose sum is σ = 30051465370584. Its totient is φ = 12427297709200.

The previous prime is 20505041220529. The next prime is 20505041220551. The reversal of 20505041220543 is 34502214050502.

It is a happy number.

It is not a de Polignac number, because 20505041220543 - 2¹³ = 20505041212351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505041220343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28243858068 + ... + 28243858793.

It is an arithmetic number, because the mean of its divisors is an integer number (2504288780882).

Almost surely, 2^{20505041220543} is an apocalyptic number.

20505041220543 is a deficient number, since it is larger than the sum of its proper divisors (9546424150041).

20505041220543 is a wasteful number, since it uses less digits than its factorization.

20505041220543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56487716886 (or 56487716875 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 20505041220543 in words is "twenty trillion, five hundred five billion, forty-one million, two hundred twenty thousand, five hundred forty-three".