20493853 has 4 divisors (see below), whose sum is σ = 20681980. Its totient is φ = 20305728.

The previous prime is 20493839. The next prime is 20493877. The reversal of 20493853 is 35839402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35839402 = 2 ⋅17919701.

It can be written as a sum of positive squares in 2 ways, for example, as 13380964 + 7112889 = 3658^2 + 2667^2 .

It is a cyclic number.

It is not a de Polignac number, because 20493853 - 2¹⁷ = 20362781 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 (20493353) 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 3 ways as a sum of consecutive naturals, for example, 93900 + ... + 94117.

It is an arithmetic number, because the mean of its divisors is an integer number (5170495).

Almost surely, 2^20493853 is an apocalyptic number.

It is an amenable number.

20493853 is a deficient number, since it is larger than the sum of its proper divisors (188127).

20493853 is a wasteful number, since it uses less digits than its factorization.

20493853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188126.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20493853 is about 4527.0136955834. The cubic root of 20493853 is about 273.6578258374.

The spelling of 20493853 in words is "twenty million, four hundred ninety-three thousand, eight hundred fifty-three".