20818853 has 8 divisors (see below), whose sum is σ = 22770720. Its totient is φ = 18876880.

The previous prime is 20818789. The next prime is 20818859. The reversal of 20818853 is 35881802.

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

It is not a de Polignac number, because 20818853 - 2⁶ = 20818789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2351 + ... + 6867.

It is an arithmetic number, because the mean of its divisors is an integer number (2846340).

Almost surely, 2^20818853 is an apocalyptic number.

It is an amenable number.

20818853 is a deficient number, since it is larger than the sum of its proper divisors (1951867).

20818853 is a wasteful number, since it uses less digits than its factorization.

20818853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4947.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 20818853 is about 4562.7681291076. The cubic root of 20818853 is about 275.0968386225.

The spelling of 20818853 in words is "twenty million, eight hundred eighteen thousand, eight hundred fifty-three".