20506066511 has 8 divisors (see below), whose sum is σ = 23474503584. Its totient is φ = 17547379200.

The previous prime is 20506066501. The next prime is 20506066513. The reversal of 20506066511 is 11566060502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20506066511 - 2¹⁰ = 20506065487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506066513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2432930 + ... + 2441343.

It is an arithmetic number, because the mean of its divisors is an integer number (2934312948).

Almost surely, 2^20506066511 is an apocalyptic number.

20506066511 is a deficient number, since it is larger than the sum of its proper divisors (2968437073).

20506066511 is an equidigital number, since it uses as much as digits as its factorization.

20506066511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874881.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 20506066511 in words is "twenty billion, five hundred six million, sixty-six thousand, five hundred eleven".