20479471 has 4 divisors (see below), whose sum is σ = 20530944. Its totient is φ = 20428000.

The previous prime is 20479439. The next prime is 20479489. The reversal of 20479471 is 17497402.

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 20479471 - 2⁵ = 20479439 is a prime.

It is a super-3 number, since 3×20479471³ (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 (20429471) 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, 25135 + ... + 25936.

It is an arithmetic number, because the mean of its divisors is an integer number (5132736).

Almost surely, 2^20479471 is an apocalyptic number.

20479471 is a deficient number, since it is larger than the sum of its proper divisors (51473).

20479471 is an equidigital number, since it uses as much as digits as its factorization.

20479471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51472.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20479471 is about 4525.4249524216. The cubic root of 20479471 is about 273.5937957780.

The spelling of 20479471 in words is "twenty million, four hundred seventy-nine thousand, four hundred seventy-one".