20392249 has 8 divisors (see below), whose sum is σ = 21303360. Its totient is φ = 19495056.

The previous prime is 20392247. The next prime is 20392261. The reversal of 20392249 is 94229302.

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 20392249 - 2¹ = 20392247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20392249.

It is not an unprimeable number, because it can be changed into a prime (20392241) 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 7 ways as a sum of consecutive naturals, for example, 427 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (2662920).

Almost surely, 2^20392249 is an apocalyptic number.

20392249 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20392249 is a deficient number, since it is larger than the sum of its proper divisors (911111).

20392249 is a wasteful number, since it uses less digits than its factorization.

20392249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6959.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20392249 is about 4515.7777846125. Note that the first 4 decimals coincide. The cubic root of 20392249 is about 273.2048313611.

The spelling of 20392249 in words is "twenty million, three hundred ninety-two thousand, two hundred forty-nine".