20011445 has 8 divisors (see below), whose sum is σ = 24175800. Its totient is φ = 15901120.

The previous prime is 20011441. The next prime is 20011463. The reversal of 20011445 is 54411002.

It can be written as a sum of positive squares in 4 ways, for example, as 844561 + 19166884 = 919^2 + 4378^2 .

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

It is not a de Polignac number, because 20011445 - 2² = 20011441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011441) 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 7 ways as a sum of consecutive naturals, for example, 12686 + ... + 14175.

It is an arithmetic number, because the mean of its divisors is an integer number (3021975).

Almost surely, 2^20011445 is an apocalyptic number.

It is an amenable number.

20011445 is a deficient number, since it is larger than the sum of its proper divisors (4164355).

20011445 is a wasteful number, since it uses less digits than its factorization.

20011445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27015.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20011445 is about 4473.4153618907. The cubic root of 20011445 is about 271.4935293021.

Adding to 20011445 its reverse (54411002), we get a palindrome (74422447).

The spelling of 20011445 in words is "twenty million, eleven thousand, four hundred forty-five".