20105522 has 4 divisors (see below), whose sum is σ = 30158286. Its totient is φ = 10052760.

The previous prime is 20105521. The next prime is 20105549. The reversal of 20105522 is 22550102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22550102 = 2 ⋅11275051.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 3613801 = 4061^2 + 1901^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20105522.

It is not an unprimeable number, because it can be changed into a prime (20105521) 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 as a sum of consecutive naturals, namely, 5026379 + ... + 5026382.

Almost surely, 2^20105522 is an apocalyptic number.

20105522 is a deficient number, since it is larger than the sum of its proper divisors (10052764).

20105522 is a wasteful number, since it uses less digits than its factorization.

20105522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052763.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20105522 is about 4483.9181526874. The cubic root of 20105522 is about 271.9183091617.

Adding to 20105522 its reverse (22550102), we get a palindrome (42655624).

The spelling of 20105522 in words is "twenty million, one hundred five thousand, five hundred twenty-two".