20444145 has 16 divisors (see below), whose sum is σ = 33106752. Its totient is φ = 10771520.

The previous prime is 20444113. The next prime is 20444147. The reversal of 20444145 is 54144402.

It is a happy number.

It is not a de Polignac number, because 20444145 - 2⁵ = 20444113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20444147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6966 + ... + 9455.

It is an arithmetic number, because the mean of its divisors is an integer number (2069172).

Almost surely, 2^20444145 is an apocalyptic number.

It is an amenable number.

20444145 is a deficient number, since it is larger than the sum of its proper divisors (12662607).

20444145 is a wasteful number, since it uses less digits than its factorization.

20444145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16512.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 20444145 is about 4521.5202089563. The cubic root of 20444145 is about 273.4363936499.

Adding to 20444145 its reverse (54144402), we get a palindrome (74588547).

The spelling of 20444145 in words is "twenty million, four hundred forty-four thousand, one hundred forty-five".