20823135 has 16 divisors (see below), whose sum is σ = 33386496. Its totient is φ = 11082528.

The previous prime is 20823109. The next prime is 20823139. The reversal of 20823135 is 53132802.

It is not a de Polignac number, because 20823135 - 2⁷ = 20823007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823139) 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, 7962 + ... + 10248.

It is an arithmetic number, because the mean of its divisors is an integer number (2086656).

Almost surely, 2^20823135 is an apocalyptic number.

20823135 is a deficient number, since it is larger than the sum of its proper divisors (12563361).

20823135 is a wasteful number, since it uses less digits than its factorization.

20823135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20823135 is about 4563.2373376803. The cubic root of 20823135 is about 275.1156978733.

Adding to 20823135 its reverse (53132802), we get a palindrome (73955937).

The spelling of 20823135 in words is "twenty million, eight hundred twenty-three thousand, one hundred thirty-five".