20311003133 has 2 divisors, whose sum is σ = 20311003134. Its totient is φ = 20311003132.

The previous prime is 20311003129. The next prime is 20311003177. The reversal of 20311003133 is 33130011302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20289723364 + 21279769 = 142442^2 + 4613^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311003133 - 2² = 20311003129 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311003333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155501566 + 10155501567.

It is an arithmetic number, because the mean of its divisors is an integer number (10155501567).

Almost surely, 2^20311003133 is an apocalyptic number.

It is an amenable number.

20311003133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311003133 is an equidigital number, since it uses as much as digits as its factorization.

20311003133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 20311003133 its reverse (33130011302), we get a palindrome (53441014435).

The spelling of 20311003133 in words is "twenty billion, three hundred eleven million, three thousand, one hundred thirty-three".