20448605 has 8 divisors (see below), whose sum is σ = 25201752. Its totient is φ = 15916608.

The previous prime is 20448599. The next prime is 20448661. The reversal of 20448605 is 50684402.

It can be written as a sum of positive squares in 4 ways, for example, as 7409284 + 13039321 = 2722^2 + 3611^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20448605 - 2¹² = 20444509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55082 + ... + 55451.

It is an arithmetic number, because the mean of its divisors is an integer number (3150219).

Almost surely, 2^20448605 is an apocalyptic number.

It is an amenable number.

20448605 is a deficient number, since it is larger than the sum of its proper divisors (4753147).

20448605 is a wasteful number, since it uses less digits than its factorization.

20448605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110575.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 20448605 is about 4522.0133790160. The cubic root of 20448605 is about 273.4562760767.

The spelling of 20448605 in words is "twenty million, four hundred forty-eight thousand, six hundred five".