20814169 has 2 divisors, whose sum is σ = 20814170. Its totient is φ = 20814168.

The previous prime is 20814161. The next prime is 20814191. The reversal of 20814169 is 96141802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 788544 = 4475^2 + 888^2 .

It is a cyclic number.

It is not a de Polignac number, because 20814169 - 2³ = 20814161 is a prime.

It is a super-2 number, since 2×20814169² = 866459262321122, which contains 22 as substring.

It is equal to p_1318954 and since 20814169 and 1318954 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20814169.

It is not a weakly prime, because it can be changed into another prime (20814161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10407084 + 10407085.

It is an arithmetic number, because the mean of its divisors is an integer number (10407085).

Almost surely, 2^20814169 is an apocalyptic number.

It is an amenable number.

20814169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20814169 is an equidigital number, since it uses as much as digits as its factorization.

20814169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20814169 is about 4562.2548153298. The cubic root of 20814169 is about 275.0762058777.

The spelling of 20814169 in words is "twenty million, eight hundred fourteen thousand, one hundred sixty-nine".