20008471 has 8 divisors (see below), whose sum is σ = 23089664. Its totient is φ = 16983000.

The previous prime is 20008447. The next prime is 20008477. The reversal of 20008471 is 17480002.

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 20008471 - 2⁷ = 20008343 is a prime.

It is a super-3 number, since 3×20008471³ (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 (20008477) 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, 13155 + ... + 14596.

It is an arithmetic number, because the mean of its divisors is an integer number (2886208).

Almost surely, 2^20008471 is an apocalyptic number.

20008471 is a deficient number, since it is larger than the sum of its proper divisors (3081193).

20008471 is a wasteful number, since it uses less digits than its factorization.

20008471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27861.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20008471 is about 4473.0829413281. The cubic root of 20008471 is about 271.4800793029.

Adding to 20008471 its reverse (17480002), we get a palindrome (37488473).

The spelling of 20008471 in words is "twenty million, eight thousand, four hundred seventy-one".