20835645 has 16 divisors (see below), whose sum is σ = 33583680. Its totient is φ = 11030144.

The previous prime is 20835643. The next prime is 20835653. The reversal of 20835645 is 54653802.

It is not a de Polignac number, because 20835645 - 2¹ = 20835643 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3015 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (2098980).

Almost surely, 2^20835645 is an apocalyptic number.

It is an amenable number.

20835645 is a deficient number, since it is larger than the sum of its proper divisors (12748035).

20835645 is a wasteful number, since it uses less digits than its factorization.

20835645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10284.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 20835645 is about 4564.6078692479. The cubic root of 20835645 is about 275.1707809717.

It can be divided in two parts, 208 and 35645, that added together give a palindrome (35853).

The spelling of 20835645 in words is "twenty million, eight hundred thirty-five thousand, six hundred forty-five".