20851113 has 8 divisors (see below), whose sum is σ = 29264800. Its totient is φ = 13169088.

The previous prime is 20851109. The next prime is 20851211. The reversal of 20851113 is 31115802.

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

It is not a de Polignac number, because 20851113 - 2² = 20851109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20851113.

It is not an unprimeable number, because it can be changed into a prime (20851213) 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 7 ways as a sum of consecutive naturals, for example, 182848 + ... + 182961.

It is an arithmetic number, because the mean of its divisors is an integer number (3658100).

Almost surely, 2^20851113 is an apocalyptic number.

It is an amenable number.

20851113 is a deficient number, since it is larger than the sum of its proper divisors (8413687).

20851113 is a wasteful number, since it uses less digits than its factorization.

20851113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365831.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 20851113 is about 4566.3018954073. The cubic root of 20851113 is about 275.2388580386.

Adding to 20851113 its reverse (31115802), we get a palindrome (51966915).

The spelling of 20851113 in words is "twenty million, eight hundred fifty-one thousand, one hundred thirteen".