20312011291 has 16 divisors (see below), whose sum is σ = 24370795008. Its totient is φ = 16682378400.

The previous prime is 20312011277. The next prime is 20312011303. The reversal of 20312011291 is 19211021302.

It is a cyclic number.

It is not a de Polignac number, because 20312011291 - 2¹¹ = 20312009243 is a prime.

It is a super-2 number, since 2×20312011291² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312011201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1504365 + ... + 1517806.

It is an arithmetic number, because the mean of its divisors is an integer number (1523174688).

Almost surely, 2^20312011291 is an apocalyptic number.

20312011291 is a deficient number, since it is larger than the sum of its proper divisors (4058783717).

20312011291 is a wasteful number, since it uses less digits than its factorization.

20312011291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022242.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 20312011291 its reverse (19211021302), we get a palindrome (39523032593).

The spelling of 20312011291 in words is "twenty billion, three hundred twelve million, eleven thousand, two hundred ninety-one".