20105575 has 12 divisors (see below), whose sum is σ = 28492720. Its totient is φ = 13786560.

The previous prime is 20105573. The next prime is 20105597. The reversal of 20105575 is 57550102.

It is a happy number.

It is not a de Polignac number, because 20105575 - 2¹ = 20105573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57270 + ... + 57619.

Almost surely, 2^20105575 is an apocalyptic number.

20105575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20105575 is a deficient number, since it is larger than the sum of its proper divisors (8387145).

20105575 is a wasteful number, since it uses less digits than its factorization.

20105575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114906 (or 114901 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 20105575 is about 4483.9240626933. The cubic root of 20105575 is about 271.9185480954.

Adding to 20105575 its reverse (57550102), we get a palindrome (77655677).

The spelling of 20105575 in words is "twenty million, one hundred five thousand, five hundred seventy-five".