20145365 has 8 divisors (see below), whose sum is σ = 24206040. Its totient is φ = 16095232.

The previous prime is 20145361. The next prime is 20145397. The reversal of 20145365 is 56354102.

It can be written as a sum of positive squares in 4 ways, for example, as 2244004 + 17901361 = 1498^2 + 4231^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20145365 - 2² = 20145361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145361) 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, 2477 + ... + 6813.

It is an arithmetic number, because the mean of its divisors is an integer number (3025755).

Almost surely, 2^20145365 is an apocalyptic number.

It is an amenable number.

20145365 is a deficient number, since it is larger than the sum of its proper divisors (4060675).

20145365 is an equidigital number, since it uses as much as digits as its factorization.

20145365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5271.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20145365 is about 4488.3588314661. The cubic root of 20145365 is about 272.0978103036.

Adding to 20145365 its reverse (56354102), we get a palindrome (76499467).

The spelling of 20145365 in words is "twenty million, one hundred forty-five thousand, three hundred sixty-five".