20311162657 has 4 divisors (see below), whose sum is σ = 20311866756. Its totient is φ = 20310458560.

The previous prime is 20311162637. The next prime is 20311162687. The reversal of 20311162657 is 75626111302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 417752721 + 19893409936 = 20439^2 + 141044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311162657 - 2¹⁵ = 20311129889 is a prime.

It is a super-2 number, since 2×20311162657² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311162637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306844 + ... + 367117.

It is an arithmetic number, because the mean of its divisors is an integer number (5077966689).

Almost surely, 2^20311162657 is an apocalyptic number.

It is an amenable number.

20311162657 is a deficient number, since it is larger than the sum of its proper divisors (704099).

20311162657 is an equidigital number, since it uses as much as digits as its factorization.

20311162657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704098.

The product of its (nonzero) digits is 15120, while the sum is 34.

Adding to 20311162657 its reverse (75626111302), we get a palindrome (95937273959).

The spelling of 20311162657 in words is "twenty billion, three hundred eleven million, one hundred sixty-two thousand, six hundred fifty-seven".