20838393 has 12 divisors (see below), whose sum is σ = 30594148. Its totient is φ = 13664160.

The previous prime is 20838329. The next prime is 20838401. The reversal of 20838393 is 39383802.

It can be written as a sum of positive squares in 2 ways, for example, as 480249 + 20358144 = 693^2 + 4512^2 .

It is not a de Polignac number, because 20838393 - 2⁶ = 20838329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20838793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18430 + ... + 19527.

Almost surely, 2^20838393 is an apocalyptic number.

It is an amenable number.

20838393 is a deficient number, since it is larger than the sum of its proper divisors (9755755).

20838393 is a wasteful number, since it uses less digits than its factorization.

20838393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38024 (or 38021 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20838393 is about 4564.9088709415. The cubic root of 20838393 is about 275.1828778065.

The spelling of 20838393 in words is "twenty million, eight hundred thirty-eight thousand, three hundred ninety-three".