20816151 has 16 divisors (see below), whose sum is σ = 28788480. Its totient is φ = 13369280.

The previous prime is 20816149. The next prime is 20816161. The reversal of 20816151 is 15161802.

It is not a de Polignac number, because 20816151 - 2¹ = 20816149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9190 + ... + 11228.

It is an arithmetic number, because the mean of its divisors is an integer number (1799280).

Almost surely, 2^20816151 is an apocalyptic number.

20816151 is a deficient number, since it is larger than the sum of its proper divisors (7972329).

20816151 is a wasteful number, since it uses less digits than its factorization.

20816151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 20816151 is about 4562.4720273115. The cubic root of 20816151 is about 275.0849368490.

Adding to 20816151 its reverse (15161802), we get a palindrome (35977953).

The spelling of 20816151 in words is "twenty million, eight hundred sixteen thousand, one hundred fifty-one".