20006445 has 16 divisors (see below), whose sum is σ = 32159232. Its totient is φ = 10620480.

The previous prime is 20006431. The next prime is 20006489. The reversal of 20006445 is 54460002.

It is a happy number.

It is not a de Polignac number, because 20006445 - 2⁴ = 20006429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355 + ... + 6335.

It is an arithmetic number, because the mean of its divisors is an integer number (2009952).

Almost surely, 2^20006445 is an apocalyptic number.

It is an amenable number.

20006445 is a deficient number, since it is larger than the sum of its proper divisors (12152787).

20006445 is a wasteful number, since it uses less digits than its factorization.

20006445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6212.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20006445 is about 4472.8564698635. The cubic root of 20006445 is about 271.4709158973.

Adding to 20006445 its reverse (54460002), we get a palindrome (74466447).

The spelling of 20006445 in words is "twenty million, six thousand, four hundred forty-five".