20344006442666 has 4 divisors (see below), whose sum is σ = 30516009664002. Its totient is φ = 10172003221332.

The previous prime is 20344006442647. The next prime is 20344006442693. The reversal of 20344006442666 is 66624460044302.

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

It can be written as a sum of positive squares in only one way, i.e., 16111626017041 + 4232380425625 = 4013929^2 + 2057275^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20344006442666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5086001610665 + ... + 5086001610668.

Almost surely, 2^{20344006442666} is an apocalyptic number.

20344006442666 is a deficient number, since it is larger than the sum of its proper divisors (10172003221336).

20344006442666 is a wasteful number, since it uses less digits than its factorization.

20344006442666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10172003221335.

The product of its (nonzero) digits is 3981312, while the sum is 47.

Adding to 20344006442666 its reverse (66624460044302), we get a palindrome (86968466486968).

The spelling of 20344006442666 in words is "twenty trillion, three hundred forty-four billion, six million, four hundred forty-two thousand, six hundred sixty-six".