20660062109 has 4 divisors (see below), whose sum is σ = 21218442204. Its totient is φ = 20101682016.

The previous prime is 20660062079. The next prime is 20660062139. The reversal of 20660062109 is 90126006602.

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

It is an interprime number because it is at equal distance from previous prime (20660062079) and next prime (20660062139).

It can be written as a sum of positive squares in 2 ways, for example, as 17094778009 + 3565284100 = 130747^2 + 59710^2 .

It is a cyclic number.

It is not a de Polignac number, because 20660062109 - 2²⁸ = 20391626653 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 (20660062139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279189992 + ... + 279190065.

It is an arithmetic number, because the mean of its divisors is an integer number (5304610551).

Almost surely, 2^20660062109 is an apocalyptic number.

It is an amenable number.

20660062109 is a deficient number, since it is larger than the sum of its proper divisors (558380095).

20660062109 is an equidigital number, since it uses as much as digits as its factorization.

20660062109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558380094.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 20660062109 in words is "twenty billion, six hundred sixty million, sixty-two thousand, one hundred nine".