20115489 has 4 divisors (see below), whose sum is σ = 26820656. Its totient is φ = 13410324.

The previous prime is 20115481. The next prime is 20115493. The reversal of 20115489 is 98451102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20115489 - 2³ = 20115481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20115481) 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, 3352579 + ... + 3352584.

It is an arithmetic number, because the mean of its divisors is an integer number (6705164).

Almost surely, 2^20115489 is an apocalyptic number.

It is an amenable number.

20115489 is a deficient number, since it is larger than the sum of its proper divisors (6705167).

20115489 is an equidigital number, since it uses as much as digits as its factorization.

20115489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705166.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 20115489 is about 4485.0294313416. The cubic root of 20115489 is about 271.9632348304.

The spelling of 20115489 in words is "twenty million, one hundred fifteen thousand, four hundred eighty-nine".