20006447 has 4 divisors (see below), whose sum is σ = 20048016. Its totient is φ = 19964880.

The previous prime is 20006431. The next prime is 20006489. The reversal of 20006447 is 74460002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74460002 = 2 ⋅37230001.

It is a cyclic number.

It is not a de Polignac number, because 20006447 - 2⁴ = 20006431 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 (20006047) 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, 20054 + ... + 21027.

It is an arithmetic number, because the mean of its divisors is an integer number (5012004).

Almost surely, 2^20006447 is an apocalyptic number.

20006447 is a deficient number, since it is larger than the sum of its proper divisors (41569).

20006447 is an equidigital number, since it uses as much as digits as its factorization.

20006447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41568.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20006447 is about 4472.8566934343. The cubic root of 20006447 is about 271.4709249434.

Adding to 20006447 its reverse (74460002), we get a palindrome (94466449).

The spelling of 20006447 in words is "twenty million, six thousand, four hundred forty-seven".