20231220031 has 64 divisors (see below), whose sum is σ = 24037171200. Its totient is φ = 16853760000.

The previous prime is 20231220017. The next prime is 20231220041. The reversal of 20231220031 is 13002213202.

It is not a de Polignac number, because 20231220031 - 2¹⁷ = 20231088959 is a prime.

It is a super-2 number, since 2×20231220031² (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 = 20231219987 and 20231220014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231220041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 88345825 + ... + 88346053.

It is an arithmetic number, because the mean of its divisors is an integer number (375580800).

Almost surely, 2^20231220031 is an apocalyptic number.

20231220031 is a deficient number, since it is larger than the sum of its proper divisors (3805951169).

20231220031 is a wasteful number, since it uses less digits than its factorization.

20231220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20231220031 its reverse (13002213202), we get a palindrome (33233433233).

The spelling of 20231220031 in words is "twenty billion, two hundred thirty-one million, two hundred twenty thousand, thirty-one".