20313231133 has 24 divisors (see below), whose sum is σ = 23373366408. Its totient is φ = 17545122816.

The previous prime is 20313231121. The next prime is 20313231173. The reversal of 20313231133 is 33113231302.

It can be written as a sum of positive squares in 12 ways, for example, as 710649 + 20312520484 = 843^2 + 142522^2 .

It is not a de Polignac number, because 20313231133 - 2¹⁷ = 20313100061 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 (20313231173) 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 23 ways as a sum of consecutive naturals, for example, 634335 + ... + 665587.

It is an arithmetic number, because the mean of its divisors is an integer number (973890267).

Almost surely, 2^20313231133 is an apocalyptic number.

It is an amenable number.

20313231133 is a deficient number, since it is larger than the sum of its proper divisors (3060135275).

20313231133 is a wasteful number, since it uses less digits than its factorization.

20313231133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31473 (or 31456 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 20313231133 its reverse (33113231302), we get a palindrome (53426462435).

The spelling of 20313231133 in words is "twenty billion, three hundred thirteen million, two hundred thirty-one thousand, one hundred thirty-three".