20042445 has 16 divisors (see below), whose sum is σ = 32751360. Its totient is φ = 10461504.

The previous prime is 20042443. The next prime is 20042459. The reversal of 20042445 is 54424002.

It is not a de Polignac number, because 20042445 - 2¹ = 20042443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042443) 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 15 ways as a sum of consecutive naturals, for example, 13510 + ... + 14919.

It is an arithmetic number, because the mean of its divisors is an integer number (2046960).

Almost surely, 2^20042445 is an apocalyptic number.

It is an amenable number.

20042445 is a deficient number, since it is larger than the sum of its proper divisors (12708915).

20042445 is a wasteful number, since it uses less digits than its factorization.

20042445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28484.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20042445 is about 4476.8789351511. The cubic root of 20042445 is about 271.6336484058.

Adding to 20042445 its reverse (54424002), we get a palindrome (74466447).

The spelling of 20042445 in words is "twenty million, forty-two thousand, four hundred forty-five".