20448487 has 4 divisors (see below), whose sum is σ = 20647120. Its totient is φ = 20249856.

The previous prime is 20448469. The next prime is 20448511. The reversal of 20448487 is 78484402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20448487 - 2¹⁹ = 19924199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99162 + ... + 99367.

It is an arithmetic number, because the mean of its divisors is an integer number (5161780).

Almost surely, 2^20448487 is an apocalyptic number.

20448487 is a deficient number, since it is larger than the sum of its proper divisors (198633).

20448487 is a wasteful number, since it uses less digits than its factorization.

20448487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198632.

The product of its (nonzero) digits is 57344, while the sum is 37.

The square root of 20448487 is about 4522.0003317116. Note that the first 3 decimals coincide. The cubic root of 20448487 is about 273.4557500766.

The spelling of 20448487 in words is "twenty million, four hundred forty-eight thousand, four hundred eighty-seven".