20644133493455 has 8 divisors (see below), whose sum is σ = 24773114977152. Its totient is φ = 16515203604768.

The previous prime is 20644133493397. The next prime is 20644133493491. The reversal of 20644133493455 is 55439433144602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20644133493455 - 2¹⁰ = 20644133492431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20644133493397 and 20644133493406.

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, 12012959 + ... + 13623488.

It is an arithmetic number, because the mean of its divisors is an integer number (3096639372144).

Almost surely, 2^{20644133493455} is an apocalyptic number.

20644133493455 is a deficient number, since it is larger than the sum of its proper divisors (4128981483697).

20644133493455 is a wasteful number, since it uses less digits than its factorization.

20644133493455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25797505.

The product of its (nonzero) digits is 18662400, while the sum is 53.

The spelling of 20644133493455 in words is "twenty trillion, six hundred forty-four billion, one hundred thirty-three million, four hundred ninety-three thousand, four hundred fifty-five".