20228269 has 2 divisors, whose sum is σ = 20228270. Its totient is φ = 20228268.

The previous prime is 20228267. The next prime is 20228279. The reversal of 20228269 is 96282202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 7767369 = 3530^2 + 2787^2 .

It is a cyclic number.

It is not a de Polignac number, because 20228269 - 2¹ = 20228267 is a prime.

It is a super-2 number, since 2×20228269² = 818365733472722, which contains 22 as substring.

Together with 20228267, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20228269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20228267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10114134 + 10114135.

It is an arithmetic number, because the mean of its divisors is an integer number (10114135).

Almost surely, 2^20228269 is an apocalyptic number.

It is an amenable number.

20228269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20228269 is an equidigital number, since it uses as much as digits as its factorization.

20228269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20228269 is about 4497.5847963101. The cubic root of 20228269 is about 272.4705531685.

The spelling of 20228269 in words is "twenty million, two hundred twenty-eight thousand, two hundred sixty-nine".