20111471 has 8 divisors (see below), whose sum is σ = 21010080. Its totient is φ = 19226592.

The previous prime is 20111447. The next prime is 20111489. The reversal of 20111471 is 17411102.

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 20111471 - 2¹⁸ = 19849327 is a prime.

It is a super-3 number, since 3×20111471³ (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 (20111411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 6353.

It is an arithmetic number, because the mean of its divisors is an integer number (2626260).

Almost surely, 2^20111471 is an apocalyptic number.

20111471 is a deficient number, since it is larger than the sum of its proper divisors (898609).

20111471 is a wasteful number, since it uses less digits than its factorization.

20111471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6865.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 20111471 is about 4484.5814743407. The cubic root of 20111471 is about 271.9451257165.

Adding to 20111471 its reverse (17411102), we get a palindrome (37522573).

The spelling of 20111471 in words is "twenty million, one hundred eleven thousand, four hundred seventy-one".