20105634 has 32 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 6334592.

The previous prime is 20105627. The next prime is 20105647. The reversal of 20105634 is 43650102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20105634.

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 15 ways as a sum of consecutive naturals, for example, 11464 + ... + 13100.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^20105634 is an apocalyptic number.

20105634 is an abundant number, since it is smaller than the sum of its proper divisors (22351326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20105634 is a wasteful number, since it uses less digits than its factorization.

20105634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20105634 is about 4483.9306417473. The cubic root of 20105634 is about 271.9188140776.

Adding to 20105634 its reverse (43650102), we get a palindrome (63755736).

The spelling of 20105634 in words is "twenty million, one hundred five thousand, six hundred thirty-four".