20423440331243 has 8 divisors (see below), whose sum is σ = 20605883367408. Its totient is φ = 20241027201024.

The previous prime is 20423440331201. The next prime is 20423440331251. The reversal of 20423440331243 is 34213304432402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20423440331243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423440331293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6103421 + ... + 8837342.

It is an arithmetic number, because the mean of its divisors is an integer number (2575735420926).

Almost surely, 2^{20423440331243} is an apocalyptic number.

20423440331243 is a deficient number, since it is larger than the sum of its proper divisors (182443036165).

20423440331243 is a wasteful number, since it uses less digits than its factorization.

20423440331243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14952973.

The product of its (nonzero) digits is 165888, while the sum is 35.

Adding to 20423440331243 its reverse (34213304432402), we get a palindrome (54636744763645).

The spelling of 20423440331243 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty million, three hundred thirty-one thousand, two hundred forty-three".