20311105611 has 8 divisors (see below), whose sum is σ = 27086631120. Its totient is φ = 13538158592.

The previous prime is 20311105603. The next prime is 20311105651. The reversal of 20311105611 is 11650111302.

It is a happy number.

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 20311105611 - 2³ = 20311105603 is a prime.

It is a super-2 number, since 2×20311105611² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20311105651) 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, 626166 + ... + 657803.

It is an arithmetic number, because the mean of its divisors is an integer number (3385828890).

Almost surely, 2^20311105611 is an apocalyptic number.

20311105611 is a deficient number, since it is larger than the sum of its proper divisors (6775525509).

20311105611 is a wasteful number, since it uses less digits than its factorization.

20311105611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289245.

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 20311105611 its reverse (11650111302), we get a palindrome (31961216913).

The spelling of 20311105611 in words is "twenty billion, three hundred eleven million, one hundred five thousand, six hundred eleven".