20047445 has 8 divisors (see below), whose sum is σ = 26244000. Its totient is φ = 14579920.

The previous prime is 20047411. The next prime is 20047453. The reversal of 20047445 is 54474002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20047445 - 2⁸ = 20047189 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182195 + ... + 182304.

It is an arithmetic number, because the mean of its divisors is an integer number (3280500).

Almost surely, 2^20047445 is an apocalyptic number.

It is an amenable number.

20047445 is a deficient number, since it is larger than the sum of its proper divisors (6196555).

20047445 is a wasteful number, since it uses less digits than its factorization.

20047445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364515.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20047445 is about 4477.4373250778. The cubic root of 20047445 is about 271.6562347272.

It can be divided in two parts, 2004 and 7445, that added together give a palindrome (9449).

The spelling of 20047445 in words is "twenty million, forty-seven thousand, four hundred forty-five".