20448405 has 12 divisors (see below), whose sum is σ = 35443980. Its totient is φ = 10905792.

The previous prime is 20448401. The next prime is 20448409. The reversal of 20448405 is 50484402.

It is an interprime number because it is at equal distance from previous prime (20448401) and next prime (20448409).

It can be written as a sum of positive squares in 2 ways, for example, as 9199089 + 11249316 = 3033^2 + 3354^2 .

It is not a de Polignac number, because 20448405 - 2² = 20448401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227160 + ... + 227249.

It is an arithmetic number, because the mean of its divisors is an integer number (2953665).

Almost surely, 2^20448405 is an apocalyptic number.

It is an amenable number.

20448405 is a deficient number, since it is larger than the sum of its proper divisors (14995575).

20448405 is a wasteful number, since it uses less digits than its factorization.

20448405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454420 (or 454417 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 20448405 is about 4521.9912649186. The cubic root of 20448405 is about 273.4553845499.

The spelling of 20448405 in words is "twenty million, four hundred forty-eight thousand, four hundred five".