20471449 has 4 divisors (see below), whose sum is σ = 21361536. Its totient is φ = 19581364.

The previous prime is 20471447. The next prime is 20471459. The reversal of 20471449 is 94417402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20471449 - 2¹ = 20471447 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20471449.

It is not an unprimeable number, because it can be changed into a prime (20471441) 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 3 ways as a sum of consecutive naturals, for example, 445009 + ... + 445054.

It is an arithmetic number, because the mean of its divisors is an integer number (5340384).

Almost surely, 2^20471449 is an apocalyptic number.

It is an amenable number.

20471449 is a deficient number, since it is larger than the sum of its proper divisors (890087).

20471449 is an equidigital number, since it uses as much as digits as its factorization.

20471449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890086.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20471449 is about 4524.5385400060. The cubic root of 20471449 is about 273.5580680312.

The spelling of 20471449 in words is "twenty million, four hundred seventy-one thousand, four hundred forty-nine".