20849653 has 8 divisors (see below), whose sum is σ = 22790880. Its totient is φ = 18916080.

The previous prime is 20849641. The next prime is 20849657. The reversal of 20849653 is 35694802.

20849653 is a nontrivial binomial coefficient, being equal to C(6458, 2).

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 20849653 - 2⁹ = 20849141 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 (20849657) 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, 4843 + ... + 8071.

It is an arithmetic number, because the mean of its divisors is an integer number (2848860).

Almost surely, 2^20849653 is an apocalyptic number.

20849653 is the 6457-th triangular number and also the 3229-th hexagonal number.

20849653 is the 2153-rd centered nonagonal number.

It is an amenable number.

20849653 is a deficient number, since it is larger than the sum of its proper divisors (1941227).

20849653 is a wasteful number, since it uses less digits than its factorization.

20849653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20849653 is about 4566.1420258244. The cubic root of 20849653 is about 275.2324337914.

The spelling of 20849653 in words is "twenty million, eight hundred forty-nine thousand, six hundred fifty-three".