20004471 has 6 divisors (see below), whose sum is σ = 28895360. Its totient is φ = 13336308.

The previous prime is 20004451. The next prime is 20004487. The reversal of 20004471 is 17440002.

It is a happy number.

It is not a de Polignac number, because 20004471 - 2⁷ = 20004343 is a prime.

It is a super-3 number, since 3×20004471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111351 + ... + 1111368.

Almost surely, 2^20004471 is an apocalyptic number.

20004471 is a deficient number, since it is larger than the sum of its proper divisors (8890889).

20004471 is a wasteful number, since it uses less digits than its factorization.

20004471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222725 (or 2222722 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20004471 is about 4472.6358000624. The cubic root of 20004471 is about 271.4619870877.

Adding to 20004471 its reverse (17440002), we get a palindrome (37444473).

The spelling of 20004471 in words is "twenty million, four thousand, four hundred seventy-one".