20115289 has 4 divisors (see below), whose sum is σ = 20154420. Its totient is φ = 20076160.

The previous prime is 20115287. The next prime is 20115307. The reversal of 20115289 is 98251102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98251102 = 2 ⋅49125551.

It can be written as a sum of positive squares in 2 ways, for example, as 5736025 + 14379264 = 2395^2 + 3792^2 .

It is a cyclic number.

It is not a de Polignac number, because 20115289 - 2¹ = 20115287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20115287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18784 + ... + 19825.

It is an arithmetic number, because the mean of its divisors is an integer number (5038605).

Almost surely, 2^20115289 is an apocalyptic number.

It is an amenable number.

20115289 is a deficient number, since it is larger than the sum of its proper divisors (39131).

20115289 is an equidigital number, since it uses as much as digits as its factorization.

20115289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39130.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 20115289 is about 4485.0071348884. The cubic root of 20115289 is about 271.9623334881.

The spelling of 20115289 in words is "twenty million, one hundred fifteen thousand, two hundred eighty-nine".