20838399 has 8 divisors (see below), whose sum is σ = 27818160. Its totient is φ = 13875456.

The previous prime is 20838329. The next prime is 20838401. The reversal of 20838399 is 99383802.

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

It is not a de Polignac number, because 20838399 - 2¹¹ = 20836351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20838399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20838329) 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, 952 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (3477270).

Almost surely, 2^20838399 is an apocalyptic number.

20838399 is a deficient number, since it is larger than the sum of its proper divisors (6979761).

20838399 is an equidigital number, since it uses as much as digits as its factorization.

20838399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8409.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 20838399 is about 4564.9095281287. The cubic root of 20838399 is about 275.1829042176.

The spelling of 20838399 in words is "twenty million, eight hundred thirty-eight thousand, three hundred ninety-nine".