20854399 has 4 divisors (see below), whose sum is σ = 21761136. Its totient is φ = 19947664.

The previous prime is 20854397. The next prime is 20854409. The reversal of 20854399 is 99345802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20854399 - 2¹ = 20854397 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20854397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453334 + ... + 453379.

It is an arithmetic number, because the mean of its divisors is an integer number (5440284).

Almost surely, 2^20854399 is an apocalyptic number.

20854399 is a deficient number, since it is larger than the sum of its proper divisors (906737).

20854399 is an equidigital number, since it uses as much as digits as its factorization.

20854399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906736.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 20854399 is about 4566.6616909949. The cubic root of 20854399 is about 275.2533158980.

The spelling of 20854399 in words is "twenty million, eight hundred fifty-four thousand, three hundred ninety-nine".