20471121 has 12 divisors (see below), whose sum is σ = 32257680. Its totient is φ = 12406680.

The previous prime is 20471119. The next prime is 20471137. The reversal of 20471121 is 12117402.

It is not a de Polignac number, because 20471121 - 2¹ = 20471119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20471094 and 20471103.

It is not an unprimeable number, because it can be changed into a prime (20471141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103291 + ... + 103488.

It is an arithmetic number, because the mean of its divisors is an integer number (2688140).

Almost surely, 2^20471121 is an apocalyptic number.

It is an amenable number.

20471121 is a deficient number, since it is larger than the sum of its proper divisors (11786559).

20471121 is a wasteful number, since it uses less digits than its factorization.

20471121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206796 (or 206793 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20471121 is about 4524.5022930705. The cubic root of 20471121 is about 273.5566070123.

Adding to 20471121 its reverse (12117402), we get a palindrome (32588523).

The spelling of 20471121 in words is "twenty million, four hundred seventy-one thousand, one hundred twenty-one".