20569135909543 has 16 divisors (see below), whose sum is σ = 22323690984672. Its totient is φ = 18839238912000.

The previous prime is 20569135909523. The next prime is 20569135909589. The reversal of 20569135909543 is 34590953196502.

It is a de Polignac number, because none of the positive numbers 2^k-20569135909543 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 (20569135909523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10987023 + ... + 12722143.

It is an arithmetic number, because the mean of its divisors is an integer number (1395230686542).

Almost surely, 2^{20569135909543} is an apocalyptic number.

20569135909543 is a deficient number, since it is larger than the sum of its proper divisors (1754555075129).

20569135909543 is a wasteful number, since it uses less digits than its factorization.

20569135909543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742226.

The product of its (nonzero) digits is 39366000, while the sum is 61.

The spelling of 20569135909543 in words is "twenty trillion, five hundred sixty-nine billion, one hundred thirty-five million, nine hundred nine thousand, five hundred forty-three".