20145465 has 12 divisors (see below), whose sum is σ = 34918884. Its totient is φ = 10744224.

The previous prime is 20145449. The next prime is 20145487. The reversal of 20145465 is 56454102.

20145465 is a `hidden beast` number, since 201 + 454 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8714304 + 11431161 = 2952^2 + 3381^2 .

It is not a de Polignac number, because 20145465 - 2⁴ = 20145449 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 223794 + ... + 223883.

It is an arithmetic number, because the mean of its divisors is an integer number (2909907).

Almost surely, 2^20145465 is an apocalyptic number.

It is an amenable number.

20145465 is a deficient number, since it is larger than the sum of its proper divisors (14773419).

20145465 is a wasteful number, since it uses less digits than its factorization.

20145465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447688 (or 447685 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20145465 is about 4488.3699713816. The cubic root of 20145465 is about 272.0982605269.

Adding to 20145465 its reverse (56454102), we get a palindrome (76599567).

The spelling of 20145465 in words is "twenty million, one hundred forty-five thousand, four hundred sixty-five".