20397269 has 2 divisors, whose sum is σ = 20397270. Its totient is φ = 20397268.

The previous prime is 20397233. The next prime is 20397313. The reversal of 20397269 is 96279302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 237169 = 4490^2 + 487^2 .

It is a cyclic number.

It is not a de Polignac number, because 20397269 - 2²⁴ = 3620053 is a prime.

It is a super-2 number, since 2×20397269² = 832097165316722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20390269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10198634 + 10198635.

It is an arithmetic number, because the mean of its divisors is an integer number (10198635).

Almost surely, 2^20397269 is an apocalyptic number.

It is an amenable number.

20397269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20397269 is an equidigital number, since it uses as much as digits as its factorization.

20397269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 20397269 is about 4516.3335793539. Note that the first 3 decimals coincide. The cubic root of 20397269 is about 273.2272479785.

The spelling of 20397269 in words is "twenty million, three hundred ninety-seven thousand, two hundred sixty-nine".