20312031133 has 2 divisors, whose sum is σ = 20312031134. Its totient is φ = 20312031132.

The previous prime is 20312031127. The next prime is 20312031191. The reversal of 20312031133 is 33113021302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20294281764 + 17749369 = 142458^2 + 4213^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312031133 - 2³³ = 11722096541 is a prime.

It is a super-2 number, since 2×20312031133² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20312031133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312091133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156015566 + 10156015567.

It is an arithmetic number, because the mean of its divisors is an integer number (10156015567).

Almost surely, 2^20312031133 is an apocalyptic number.

It is an amenable number.

20312031133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312031133 is an equidigital number, since it uses as much as digits as its factorization.

20312031133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20312031133 its reverse (33113021302), we get a palindrome (53425052435).

The spelling of 20312031133 in words is "twenty billion, three hundred twelve million, thirty-one thousand, one hundred thirty-three".