20043343531 has 2 divisors, whose sum is σ = 20043343532. Its totient is φ = 20043343530.

The previous prime is 20043343513. The next prime is 20043343543. The reversal of 20043343531 is 13534334002.

Together with previous prime (20043343513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20043343531 - 2⁷ = 20043343403 is a prime.

It is a super-2 number, since 2×20043343531² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20043343531.

It is not a weakly prime, because it can be changed into another prime (20043343501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021671765 + 10021671766.

It is an arithmetic number, because the mean of its divisors is an integer number (10021671766).

Almost surely, 2^20043343531 is an apocalyptic number.

20043343531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20043343531 is an equidigital number, since it uses as much as digits as its factorization.

20043343531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 28.

Adding to 20043343531 its reverse (13534334002), we get a palindrome (33577677533).

The spelling of 20043343531 in words is "twenty billion, forty-three million, three hundred forty-three thousand, five hundred thirty-one".