20853489 has 8 divisors (see below), whose sum is σ = 27920992. Its totient is φ = 13844160.

The previous prime is 20853473. The next prime is 20853493. The reversal of 20853489 is 98435802.

It is a happy number.

20853489 is nontrivially palindromic in base 4.

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

It is not a de Polignac number, because 20853489 - 2⁴ = 20853473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20853419) 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, 13699 + ... + 15144.

It is an arithmetic number, because the mean of its divisors is an integer number (3490124).

Almost surely, 2^20853489 is an apocalyptic number.

It is an amenable number.

20853489 is a deficient number, since it is larger than the sum of its proper divisors (7067503).

20853489 is a wasteful number, since it uses less digits than its factorization.

20853489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29087.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 20853489 is about 4566.5620547629. The cubic root of 20853489 is about 275.2493121998.

The spelling of 20853489 in words is "twenty million, eight hundred fifty-three thousand, four hundred eighty-nine".