20559471 has 8 divisors (see below), whose sum is σ = 27664560. Its totient is φ = 13580352.

The previous prime is 20559449. The next prime is 20559503. The reversal of 20559471 is 17495502.

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

It is not a de Polignac number, because 20559471 - 2⁹ = 20558959 is a prime.

It is a super-3 number, since 3×20559471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20559421) 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, 31110 + ... + 31763.

It is an arithmetic number, because the mean of its divisors is an integer number (3458070).

Almost surely, 2^20559471 is an apocalyptic number.

20559471 is a deficient number, since it is larger than the sum of its proper divisors (7105089).

20559471 is a wasteful number, since it uses less digits than its factorization.

20559471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62985.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 20559471 is about 4534.2552861523. The cubic root of 20559471 is about 273.9495840250.

The spelling of 20559471 in words is "twenty million, five hundred fifty-nine thousand, four hundred seventy-one".