20388249 has 12 divisors (see below), whose sum is σ = 33656896. Its totient is φ = 11650392.

The previous prime is 20388211. The next prime is 20388283. The reversal of 20388249 is 94288302.

It is not a de Polignac number, because 20388249 - 2⁸ = 20387993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20388449) 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 11 ways as a sum of consecutive naturals, for example, 161749 + ... + 161874.

Almost surely, 2^20388249 is an apocalyptic number.

It is an amenable number.

20388249 is a deficient number, since it is larger than the sum of its proper divisors (13268647).

20388249 is a wasteful number, since it uses less digits than its factorization.

20388249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323636 (or 323633 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20388249 is about 4515.3348713025. The cubic root of 20388249 is about 273.1869668809.

The spelling of 20388249 in words is "twenty million, three hundred eighty-eight thousand, two hundred forty-nine".