20105385 has 8 divisors (see below), whose sum is σ = 32168640. Its totient is φ = 10722864.

The previous prime is 20105383. The next prime is 20105387. The reversal of 20105385 is 58350102.

It is an interprime number because it is at equal distance from previous prime (20105383) and next prime (20105387).

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

It is not a de Polignac number, because 20105385 - 2¹ = 20105383 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20105383) 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 7 ways as a sum of consecutive naturals, for example, 670165 + ... + 670194.

It is an arithmetic number, because the mean of its divisors is an integer number (4021080).

Almost surely, 2^20105385 is an apocalyptic number.

It is an amenable number.

20105385 is a deficient number, since it is larger than the sum of its proper divisors (12063255).

20105385 is a wasteful number, since it uses less digits than its factorization.

20105385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340367.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20105385 is about 4483.9028758438. The cubic root of 20105385 is about 271.9176915388.

Adding to 20105385 its reverse (58350102), we get a palindrome (78455487).

The spelling of 20105385 in words is "twenty million, one hundred five thousand, three hundred eighty-five".