20471331 has 4 divisors (see below), whose sum is σ = 27295112. Its totient is φ = 13647552.

The previous prime is 20471327. The next prime is 20471389. The reversal of 20471331 is 13317402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20471331 - 2² = 20471327 is a prime.

It is a super-2 number, since 2×20471331² = 838150785823122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20471298 and 20471307.

It is not an unprimeable number, because it can be changed into a prime (20473331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3411886 + ... + 3411891.

It is an arithmetic number, because the mean of its divisors is an integer number (6823778).

Almost surely, 2^20471331 is an apocalyptic number.

20471331 is a deficient number, since it is larger than the sum of its proper divisors (6823781).

20471331 is an equidigital number, since it uses as much as digits as its factorization.

20471331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823780.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20471331 is about 4524.5254999834. The cubic root of 20471331 is about 273.5575424225.

Adding to 20471331 its reverse (13317402), we get a palindrome (33788733).

It can be divided in two parts, 20471 and 331, that added together give a palindrome (20802).

The spelling of 20471331 in words is "twenty million, four hundred seventy-one thousand, three hundred thirty-one".