20004385 has 8 divisors (see below), whose sum is σ = 24132096. Its totient is φ = 15918960.

The previous prime is 20004367. The next prime is 20004419. The reversal of 20004385 is 58340002.

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

It is not a de Polignac number, because 20004385 - 2¹¹ = 20002337 is a prime.

It is a super-3 number, since 3×20004385³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9519 + ... + 11428.

It is an arithmetic number, because the mean of its divisors is an integer number (3016512).

Almost surely, 2^20004385 is an apocalyptic number.

It is an amenable number.

20004385 is a deficient number, since it is larger than the sum of its proper divisors (4127711).

20004385 is a wasteful number, since it uses less digits than its factorization.

20004385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21143.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20004385 is about 4472.6261860343. The cubic root of 20004385 is about 271.4615980786.

Adding to 20004385 its reverse (58340002), we get a palindrome (78344387).

The spelling of 20004385 in words is "twenty million, four thousand, three hundred eighty-five".