20704471 has 4 divisors (see below), whose sum is σ = 21794200. Its totient is φ = 19614744.

The previous prime is 20704469. The next prime is 20704499. The reversal of 20704471 is 17440702.

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 20704471 - 2¹ = 20704469 is a prime.

It is a super-3 number, since 3×20704471³ (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 (20704171) 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, 544836 + ... + 544873.

It is an arithmetic number, because the mean of its divisors is an integer number (5448550).

Almost surely, 2^20704471 is an apocalyptic number.

20704471 is a deficient number, since it is larger than the sum of its proper divisors (1089729).

20704471 is a wasteful number, since it uses less digits than its factorization.

20704471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089728.

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

The square root of 20704471 is about 4550.2165882516. The cubic root of 20704471 is about 274.5921049287.

The spelling of 20704471 in words is "twenty million, seven hundred four thousand, four hundred seventy-one".