20344646543566 has 16 divisors (see below), whose sum is σ = 32123745190800. Its totient is φ = 9636752115648.

The previous prime is 20344646543531. The next prime is 20344646543657. The reversal of 20344646543566 is 66534564644302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20344646543566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3151021 + ... + 7114648.

It is an arithmetic number, because the mean of its divisors is an integer number (2007734074425).

Almost surely, 2^{20344646543566} is an apocalyptic number.

20344646543566 is a deficient number, since it is larger than the sum of its proper divisors (11779098647234).

20344646543566 is a wasteful number, since it uses less digits than its factorization.

20344646543566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10317843.

The product of its (nonzero) digits is 149299200, while the sum is 58.

The spelling of 20344646543566 in words is "twenty trillion, three hundred forty-four billion, six hundred forty-six million, five hundred forty-three thousand, five hundred sixty-six".