20824135 has 4 divisors (see below), whose sum is σ = 24988968. Its totient is φ = 16659304.

The previous prime is 20824127. The next prime is 20824147. The reversal of 20824135 is 53142802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20824135 - 2³ = 20824127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2082409 + ... + 2082418.

It is an arithmetic number, because the mean of its divisors is an integer number (6247242).

Almost surely, 2^20824135 is an apocalyptic number.

20824135 is a deficient number, since it is larger than the sum of its proper divisors (4164833).

20824135 is an equidigital number, since it uses as much as digits as its factorization.

20824135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4164832.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20824135 is about 4563.3469076983. The cubic root of 20824135 is about 275.1201018098.

Adding to 20824135 its reverse (53142802), we get a palindrome (73966937).

The spelling of 20824135 in words is "twenty million, eight hundred twenty-four thousand, one hundred thirty-five".