20321020031 has 4 divisors (see below), whose sum is σ = 21884175432. Its totient is φ = 18757864632.

The previous prime is 20321020003. The next prime is 20321020043. The reversal of 20321020031 is 13002012302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13002012302 = 2 ⋅6501006151.

It is not a de Polignac number, because 20321020031 - 2⁶ = 20321019967 is a prime.

It is a super-2 number, since 2×20321020031² (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 = 20321019988 and 20321020015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321020051) 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, 781577681 + ... + 781577706.

It is an arithmetic number, because the mean of its divisors is an integer number (5471043858).

Almost surely, 2^20321020031 is an apocalyptic number.

20321020031 is a deficient number, since it is larger than the sum of its proper divisors (1563155401).

20321020031 is a wasteful number, since it uses less digits than its factorization.

20321020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563155400.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20321020031 its reverse (13002012302), we get a palindrome (33323032333).

The spelling of 20321020031 in words is "twenty billion, three hundred twenty-one million, twenty thousand, thirty-one".