20128269 has 32 divisors (see below), whose sum is σ = 32358400. Its totient is φ = 11113200.

The previous prime is 20128223. The next prime is 20128279. The reversal of 20128269 is 96282102.

It is not a de Polignac number, because 20128269 - 2¹¹ = 20126221 is a prime.

It is a super-2 number, since 2×20128269² = 810294425872722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31584 + ... + 32214.

It is an arithmetic number, because the mean of its divisors is an integer number (1011200).

Almost surely, 2^20128269 is an apocalyptic number.

It is an amenable number.

20128269 is a deficient number, since it is larger than the sum of its proper divisors (12230131).

20128269 is an equidigital number, since it uses as much as digits as its factorization.

20128269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20128269 is about 4486.4539449325. The cubic root of 20128269 is about 272.0208182235.

The spelling of 20128269 in words is "twenty million, one hundred twenty-eight thousand, two hundred sixty-nine".