20047471 has 4 divisors (see below), whose sum is σ = 21226752. Its totient is φ = 18868192.

The previous prime is 20047453. The next prime is 20047493. The reversal of 20047471 is 17474002.

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 20047471 - 2⁹ = 20046959 is a prime.

It is a super-3 number, since 3×20047471³ (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 (20047411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589615 + ... + 589648.

It is an arithmetic number, because the mean of its divisors is an integer number (5306688).

Almost surely, 2^20047471 is an apocalyptic number.

20047471 is a deficient number, since it is larger than the sum of its proper divisors (1179281).

20047471 is a wasteful number, since it uses less digits than its factorization.

20047471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179280.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 20047471 is about 4477.4402285234. The cubic root of 20047471 is about 271.6563521663.

The spelling of 20047471 in words is "twenty million, forty-seven thousand, four hundred seventy-one".