20611560071 has 4 divisors (see below), whose sum is σ = 20657466000. Its totient is φ = 20565654144.

The previous prime is 20611559989. The next prime is 20611560077. The reversal of 20611560071 is 17006511602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20611560071 - 2³⁰ = 19537818247 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 (20611560077) 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, 22952291 + ... + 22953188.

It is an arithmetic number, because the mean of its divisors is an integer number (5164366500).

Almost surely, 2^20611560071 is an apocalyptic number.

20611560071 is a deficient number, since it is larger than the sum of its proper divisors (45905929).

20611560071 is an equidigital number, since it uses as much as digits as its factorization.

20611560071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45905928.

The product of its (nonzero) digits is 2520, while the sum is 29.

The spelling of 20611560071 in words is "twenty billion, six hundred eleven million, five hundred sixty thousand, seventy-one".