20331031243 has 4 divisors (see below), whose sum is σ = 20338165288. Its totient is φ = 20323897200.

The previous prime is 20331031223. The next prime is 20331031277. The reversal of 20331031243 is 34213013302.

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 20331031243 - 2¹⁷ = 20330900171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20331031213) 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, 3562746 + ... + 3568447.

It is an arithmetic number, because the mean of its divisors is an integer number (5084541322).

Almost surely, 2^20331031243 is an apocalyptic number.

20331031243 is a deficient number, since it is larger than the sum of its proper divisors (7134045).

20331031243 is an equidigital number, since it uses as much as digits as its factorization.

20331031243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7134044.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20331031243 its reverse (34213013302), we get a palindrome (54544044545).

The spelling of 20331031243 in words is "twenty billion, three hundred thirty-one million, thirty-one thousand, two hundred forty-three".