20321310169 has 2 divisors, whose sum is σ = 20321310170. Its totient is φ = 20321310168.

The previous prime is 20321310161. The next prime is 20321310173. The reversal of 20321310169 is 96101312302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13123993600 + 7197316569 = 114560^2 + 84837^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321310169 - 2³ = 20321310161 is a prime.

It is a super-2 number, since 2×20321310169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20321310161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160655084 + 10160655085.

It is an arithmetic number, because the mean of its divisors is an integer number (10160655085).

Almost surely, 2^20321310169 is an apocalyptic number.

It is an amenable number.

20321310169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321310169 is an equidigital number, since it uses as much as digits as its factorization.

20321310169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 20321310169 in words is "twenty billion, three hundred twenty-one million, three hundred ten thousand, one hundred sixty-nine".