20816135 has 16 divisors (see below), whose sum is σ = 25546752. Its totient is φ = 16279200.

The previous prime is 20816129. The next prime is 20816149. The reversal of 20816135 is 53161802.

It is not a de Polignac number, because 20816135 - 2⁴ = 20816119 is a prime.

It is a super-2 number, since 2×20816135² = 866622952676450, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 67652 + ... + 67958.

It is an arithmetic number, because the mean of its divisors is an integer number (1596672).

Almost surely, 2^20816135 is an apocalyptic number.

20816135 is a deficient number, since it is larger than the sum of its proper divisors (4730617).

20816135 is a wasteful number, since it uses less digits than its factorization.

20816135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20816135 is about 4562.4702738758. The cubic root of 20816135 is about 275.0848663691.

Adding to 20816135 its reverse (53161802), we get a palindrome (73977937).

The spelling of 20816135 in words is "twenty million, eight hundred sixteen thousand, one hundred thirty-five".