20136611311660 has 96 divisors (see below), whose sum is σ = 43665643929600. Its totient is φ = 7795192204800.

The previous prime is 20136611311633. The next prime is 20136611311693. The reversal of 20136611311660 is 6611311663102.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1395364645 + ... + 1395379075.

It is an arithmetic number, because the mean of its divisors is an integer number (454850457600).

Almost surely, 2^{20136611311660} is an apocalyptic number.

20136611311660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20136611311660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21832821964800).

20136611311660 is an abundant number, since it is smaller than the sum of its proper divisors (23529032617940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20136611311660 is a wasteful number, since it uses less digits than its factorization.

20136611311660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28007 (or 28005 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

Adding to 20136611311660 its reverse (6611311663102), we get a palindrome (26747922974762).

The spelling of 20136611311660 in words is "twenty trillion, one hundred thirty-six billion, six hundred eleven million, three hundred eleven thousand, six hundred sixty".