20090447 has 8 divisors (see below), whose sum is σ = 22908816. Its totient is φ = 17453952.

The previous prime is 20090437. The next prime is 20090471. The reversal of 20090447 is 74409002.

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 20090447 - 2²⁰ = 19041871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090407) 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, 45233 + ... + 45674.

It is an arithmetic number, because the mean of its divisors is an integer number (2863602).

Almost surely, 2^20090447 is an apocalyptic number.

20090447 is a deficient number, since it is larger than the sum of its proper divisors (2818369).

20090447 is a wasteful number, since it uses less digits than its factorization.

20090447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90937.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20090447 is about 4482.2368299767. The cubic root of 20090447 is about 271.8503312624.

Adding to 20090447 its reverse (74409002), we get a palindrome (94499449).

The spelling of 20090447 in words is "twenty million, ninety thousand, four hundred forty-seven".