20113113031 has 4 divisors (see below), whose sum is σ = 21941577864. Its totient is φ = 18284648200.

The previous prime is 20113113017. The next prime is 20113113061. The reversal of 20113113031 is 13031131102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20113113031 - 2¹³ = 20113104839 is a prime.

It is a super-2 number, since 2×20113113031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20113112996 and 20113113014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113113061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914232400 + ... + 914232421.

It is an arithmetic number, because the mean of its divisors is an integer number (5485394466).

Almost surely, 2^20113113031 is an apocalyptic number.

20113113031 is a deficient number, since it is larger than the sum of its proper divisors (1828464833).

20113113031 is a wasteful number, since it uses less digits than its factorization.

20113113031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828464832.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 20113113031 its reverse (13031131102), we get a palindrome (33144244133).

The spelling of 20113113031 in words is "twenty billion, one hundred thirteen million, one hundred thirteen thousand, thirty-one".