20005489 has 8 divisors (see below), whose sum is σ = 22923648. Its totient is φ = 17102400.

The previous prime is 20005483. The next prime is 20005501. The reversal of 20005489 is 98450002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20005489 - 2⁷ = 20005361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757 + ... + 6370.

It is an arithmetic number, because the mean of its divisors is an integer number (2865456).

Almost surely, 2^20005489 is an apocalyptic number.

It is an amenable number.

20005489 is a deficient number, since it is larger than the sum of its proper divisors (2918159).

20005489 is an equidigital number, since it uses as much as digits as its factorization.

20005489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7535.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20005489 is about 4472.7496017551. The cubic root of 20005489 is about 271.4665917852.

The spelling of 20005489 in words is "twenty million, five thousand, four hundred eighty-nine".