20009445 has 8 divisors (see below), whose sum is σ = 32015136. Its totient is φ = 10671696.

The previous prime is 20009443. The next prime is 20009447. The reversal of 20009445 is 54490002.

It is an interprime number because it is at equal distance from previous prime (20009443) and next prime (20009447).

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

It is not a de Polignac number, because 20009445 - 2¹ = 20009443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666967 + ... + 666996.

It is an arithmetic number, because the mean of its divisors is an integer number (4001892).

Almost surely, 2^20009445 is an apocalyptic number.

It is an amenable number.

20009445 is a deficient number, since it is larger than the sum of its proper divisors (12005691).

20009445 is a wasteful number, since it uses less digits than its factorization.

20009445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333971.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20009445 is about 4473.1918134594. The cubic root of 20009445 is about 271.4844843922.

Adding to 20009445 its reverse (54490002), we get a palindrome (74499447).

The spelling of 20009445 in words is "twenty million, nine thousand, four hundred forty-five".