20606011543 has 4 divisors (see below), whose sum is σ = 22191089368. Its totient is φ = 19020933720.

The previous prime is 20606011541. The next prime is 20606011577. The reversal of 20606011543 is 34511060602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34511060602 = 2 ⋅17255530301.

It is a cyclic number.

It is not a de Polignac number, because 20606011543 - 2¹ = 20606011541 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 (20606011541) 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 3 ways as a sum of consecutive naturals, for example, 792538893 + ... + 792538918.

It is an arithmetic number, because the mean of its divisors is an integer number (5547772342).

Almost surely, 2^20606011543 is an apocalyptic number.

20606011543 is a deficient number, since it is larger than the sum of its proper divisors (1585077825).

20606011543 is a wasteful number, since it uses less digits than its factorization.

20606011543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585077824.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 20606011543 in words is "twenty billion, six hundred six million, eleven thousand, five hundred forty-three".