20445166 has 8 divisors (see below), whose sum is σ = 35048880. Its totient is φ = 8762208.

The previous prime is 20445149. The next prime is 20445179. The reversal of 20445166 is 66154402.

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

It is a super-3 number, since 3×20445166³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730171 + ... + 730198.

It is an arithmetic number, because the mean of its divisors is an integer number (4381110).

Almost surely, 2^20445166 is an apocalyptic number.

20445166 is a deficient number, since it is larger than the sum of its proper divisors (14603714).

20445166 is a wasteful number, since it uses less digits than its factorization.

20445166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460378.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20445166 is about 4521.6331120514. The cubic root of 20445166 is about 273.4409454652.

Adding to 20445166 its reverse (66154402), we get a palindrome (86599568).

The spelling of 20445166 in words is "twenty million, four hundred forty-five thousand, one hundred sixty-six".