13120020031 has 4 divisors (see below), whose sum is σ = 13123094752. Its totient is φ = 13116945312.

The previous prime is 13120019989. The next prime is 13120020047. The reversal of 13120020031 is 13002002131.

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 13120020031 - 2¹⁷ = 13119888959 is a prime.

It is a super-2 number, since 2×13120020031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 13120019993 and 13120020020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13120020631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530951 + ... + 1539496.

It is an arithmetic number, because the mean of its divisors is an integer number (3280773688).

Almost surely, 2^13120020031 is an apocalyptic number.

13120020031 is a deficient number, since it is larger than the sum of its proper divisors (3074721).

13120020031 is an equidigital number, since it uses as much as digits as its factorization.

13120020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3074720.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 13120020031 its reverse (13002002131), we get a palindrome (26122022162).

The spelling of 13120020031 in words is "thirteen billion, one hundred twenty million, twenty thousand, thirty-one".