20311064005 has 8 divisors (see below), whose sum is σ = 24967747224. Its totient is φ = 15852537600.

The previous prime is 20311063999. The next prime is 20311064009. The reversal of 20311064005 is 50046011302.

It can be written as a sum of positive squares in 4 ways, for example, as 2005785796 + 18305278209 = 44786^2 + 135297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20311064005 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 (20311064009) 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, 49538976 + ... + 49539385.

It is an arithmetic number, because the mean of its divisors is an integer number (3120968403).

Almost surely, 2^20311064005 is an apocalyptic number.

It is an amenable number.

20311064005 is a deficient number, since it is larger than the sum of its proper divisors (4656683219).

20311064005 is an equidigital number, since it uses as much as digits as its factorization.

20311064005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99078407.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20311064005 its reverse (50046011302), we get a palindrome (70357075307).

The spelling of 20311064005 in words is "twenty billion, three hundred eleven million, sixty-four thousand, five".