20111445 has 12 divisors (see below), whose sum is σ = 34859916. Its totient is φ = 10726080.

The previous prime is 20111411. The next prime is 20111447. The reversal of 20111445 is 54411102.

It can be written as a sum of positive squares in 2 ways, for example, as 13439556 + 6671889 = 3666^2 + 2583^2 .

It is not a de Polignac number, because 20111445 - 2⁷ = 20111317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111447) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 223416 + ... + 223505.

It is an arithmetic number, because the mean of its divisors is an integer number (2904993).

Almost surely, 2^20111445 is an apocalyptic number.

It is an amenable number.

20111445 is a deficient number, since it is larger than the sum of its proper divisors (14748471).

20111445 is a wasteful number, since it uses less digits than its factorization.

20111445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446932 (or 446929 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20111445 is about 4484.5785755186. The cubic root of 20111445 is about 271.9450085268.

Adding to 20111445 its reverse (54411102), we get a palindrome (74522547).

The spelling of 20111445 in words is "twenty million, one hundred eleven thousand, four hundred forty-five".