20111312031 has 8 divisors (see below), whose sum is σ = 27680085504. Its totient is φ = 12975039960.

The previous prime is 20111312027. The next prime is 20111312041. The reversal of 20111312031 is 13021311102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111312031 - 2² = 20111312027 is a prime.

It is a super-2 number, since 2×20111312031² (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 20111312031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111312041) 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 7 ways as a sum of consecutive naturals, for example, 108125241 + ... + 108125426.

It is an arithmetic number, because the mean of its divisors is an integer number (3460010688).

Almost surely, 2^20111312031 is an apocalyptic number.

20111312031 is a deficient number, since it is larger than the sum of its proper divisors (7568773473).

20111312031 is a wasteful number, since it uses less digits than its factorization.

20111312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216250701.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20111312031 its reverse (13021311102), we get a palindrome (33132623133).

The spelling of 20111312031 in words is "twenty billion, one hundred eleven million, three hundred twelve thousand, thirty-one".