20321066256523 has 8 divisors (see below), whose sum is σ = 21545073472320. Its totient is φ = 19100242416000.

The previous prime is 20321066256511. The next prime is 20321066256529. The reversal of 20321066256523 is 32565266012302.

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 20321066256523 - 2⁹ = 20321066256011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321066256523.

It is not an unprimeable number, because it can be changed into a prime (20321066256529) 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, 795830668 + ... + 795856201.

It is an arithmetic number, because the mean of its divisors is an integer number (2693134184040).

Almost surely, 2^{20321066256523} is an apocalyptic number.

20321066256523 is a deficient number, since it is larger than the sum of its proper divisors (1224007215797).

20321066256523 is a wasteful number, since it uses less digits than its factorization.

20321066256523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591687637.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 20321066256523 in words is "twenty trillion, three hundred twenty-one billion, sixty-six million, two hundred fifty-six thousand, five hundred twenty-three".