20611080605 has 16 divisors (see below), whose sum is σ = 25063610544. Its totient is φ = 16269772800.

The previous prime is 20611080601. The next prime is 20611080617. The reversal of 20611080605 is 50608011602.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9366174841 + 11244905764 = 96779^2 + 106042^2 .

It is not a de Polignac number, because 20611080605 - 2² = 20611080601 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 (20611080601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78317 + ... + 217613.

It is an arithmetic number, because the mean of its divisors is an integer number (1566475659).

Almost surely, 2^20611080605 is an apocalyptic number.

It is an amenable number.

20611080605 is a deficient number, since it is larger than the sum of its proper divisors (4452529939).

20611080605 is a wasteful number, since it uses less digits than its factorization.

20611080605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139696.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 20611080605 in words is "twenty billion, six hundred eleven million, eighty thousand, six hundred five".