20685748884223 has 2 divisors, whose sum is σ = 20685748884224. Its totient is φ = 20685748884222.

The previous prime is 20685748884221. The next prime is 20685748884259. The reversal of 20685748884223 is 32248884758602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20685748884223 - 2¹ = 20685748884221 is a prime.

It is a super-2 number, since 2×20685748884223² (a number of 27 digits) contains 22 as substring.

Together with 20685748884221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20685748884221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10342874442111 + 10342874442112.

It is an arithmetic number, because the mean of its divisors is an integer number (10342874442112).

Almost surely, 2^{20685748884223} is an apocalyptic number.

20685748884223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20685748884223 is an equidigital number, since it uses as much as digits as its factorization.

20685748884223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 330301440, while the sum is 67.

The spelling of 20685748884223 in words is "twenty trillion, six hundred eighty-five billion, seven hundred forty-eight million, eight hundred eighty-four thousand, two hundred twenty-three".