20031123131 has 16 divisors (see below), whose sum is σ = 21221601600. Its totient is φ = 18868101120.

The previous prime is 20031123127. The next prime is 20031123143. The reversal of 20031123131 is 13132113002.

It is a cyclic number.

It is not a de Polignac number, because 20031123131 - 2² = 20031123127 is a prime.

It is a super-2 number, since 2×20031123131² (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 (20031123181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1100795 + ... + 1118843.

It is an arithmetic number, because the mean of its divisors is an integer number (1326350100).

Almost surely, 2^20031123131 is an apocalyptic number.

20031123131 is a deficient number, since it is larger than the sum of its proper divisors (1190478469).

20031123131 is a wasteful number, since it uses less digits than its factorization.

20031123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18806.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20031123131 its reverse (13132113002), we get a palindrome (33163236133).

The spelling of 20031123131 in words is "twenty billion, thirty-one million, one hundred twenty-three thousand, one hundred thirty-one".