20531443441 has 4 divisors (see below), whose sum is σ = 20532270052. Its totient is φ = 20530616832.

The previous prime is 20531443423. The next prime is 20531443459. The reversal of 20531443441 is 14434413502.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20531443423) and next prime (20531443459).

It can be written as a sum of positive squares in 2 ways, for example, as 5419904400 + 15111539041 = 73620^2 + 122929^2 .

It is a cyclic number.

It is not a de Polignac number, because 20531443441 - 2²⁹ = 19994572529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531443411) 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, 374856 + ... + 426121.

It is an arithmetic number, because the mean of its divisors is an integer number (5133067513).

Almost surely, 2^20531443441 is an apocalyptic number.

It is an amenable number.

20531443441 is a deficient number, since it is larger than the sum of its proper divisors (826611).

20531443441 is an equidigital number, since it uses as much as digits as its factorization.

20531443441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826610.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 20531443441 its reverse (14434413502), we get a palindrome (34965856943).

The spelling of 20531443441 in words is "twenty billion, five hundred thirty-one million, four hundred forty-three thousand, four hundred forty-one".