20312012133 has 12 divisors (see below), whose sum is σ = 33530940768. Its totient is φ = 11606864040.

The previous prime is 20312012113. The next prime is 20312012141. The reversal of 20312012133 is 33121021302.

It is not a de Polignac number, because 20312012133 - 2¹² = 20312008037 is a prime.

It is a super-2 number, since 2×20312012133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312012113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161206383 + ... + 161206508.

It is an arithmetic number, because the mean of its divisors is an integer number (2794245064).

Almost surely, 2^20312012133 is an apocalyptic number.

It is an amenable number.

20312012133 is a deficient number, since it is larger than the sum of its proper divisors (13218928635).

20312012133 is a wasteful number, since it uses less digits than its factorization.

20312012133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322412904 (or 322412901 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20312012133 its reverse (33121021302), we get a palindrome (53433033435).

The spelling of 20312012133 in words is "twenty billion, three hundred twelve million, twelve thousand, one hundred thirty-three".