20964169 has 2 divisors, whose sum is σ = 20964170. Its totient is φ = 20964168.

The previous prime is 20964157. The next prime is 20964197. The reversal of 20964169 is 96146902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20793600 + 170569 = 4560^2 + 413^2 .

It is a cyclic number.

It is not a de Polignac number, because 20964169 - 2⁵ = 20964137 is a prime.

It is a super-2 number, since 2×20964169² = 878992763721122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20964269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482084 + 10482085.

It is an arithmetic number, because the mean of its divisors is an integer number (10482085).

Almost surely, 2^20964169 is an apocalyptic number.

It is an amenable number.

20964169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20964169 is an equidigital number, since it uses as much as digits as its factorization.

20964169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20964169 is about 4578.6645432921. The cubic root of 20964169 is about 275.7354155922.

The spelling of 20964169 in words is "twenty million, nine hundred sixty-four thousand, one hundred sixty-nine".