20806131 has 8 divisors (see below), whose sum is σ = 27895504. Its totient is φ = 13793760.

The previous prime is 20806127. The next prime is 20806141. The reversal of 20806131 is 13160802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20806131 - 2² = 20806127 is a prime.

It is a super-2 number, since 2×20806131² = 865790174378322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20806098 and 20806107.

It is not an unprimeable number, because it can be changed into a prime (20806141) 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 7 ways as a sum of consecutive naturals, for example, 18616 + ... + 19701.

It is an arithmetic number, because the mean of its divisors is an integer number (3486938).

Almost surely, 2^20806131 is an apocalyptic number.

20806131 is a deficient number, since it is larger than the sum of its proper divisors (7089373).

20806131 is a wasteful number, since it uses less digits than its factorization.

20806131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38501.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20806131 is about 4561.3738062123. The cubic root of 20806131 is about 275.0407917451.

Adding to 20806131 its reverse (13160802), we get a palindrome (33966933).

The spelling of 20806131 in words is "twenty million, eight hundred six thousand, one hundred thirty-one".