20853311 has 8 divisors (see below), whose sum is σ = 21488544. Its totient is φ = 20221920.

The previous prime is 20853299. The next prime is 20853319. The reversal of 20853311 is 11335802.

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

It is a cyclic number.

It is not a de Polignac number, because 20853311 - 2¹⁴ = 20836927 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 (20853319) 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, 13046 + ... + 14556.

It is an arithmetic number, because the mean of its divisors is an integer number (2686068).

Almost surely, 2^20853311 is an apocalyptic number.

20853311 is a deficient number, since it is larger than the sum of its proper divisors (635233).

20853311 is a wasteful number, since it uses less digits than its factorization.

20853311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20853311 is about 4566.5425652237. The cubic root of 20853311 is about 275.2485290452.

The spelling of 20853311 in words is "twenty million, eight hundred fifty-three thousand, three hundred eleven".