20146865 has 4 divisors (see below), whose sum is σ = 24176244. Its totient is φ = 16117488.

The previous prime is 20146831. The next prime is 20146927. The reversal of 20146865 is 56864102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11242609 + 8904256 = 3353^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 20146865 - 2⁶ = 20146801 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 2014682 + ... + 2014691.

It is an arithmetic number, because the mean of its divisors is an integer number (6044061).

Almost surely, 2^20146865 is an apocalyptic number.

It is an amenable number.

20146865 is a deficient number, since it is larger than the sum of its proper divisors (4029379).

20146865 is an equidigital number, since it uses as much as digits as its factorization.

20146865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029378.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20146865 is about 4488.5259272951. The cubic root of 20146865 is about 272.1045634962.

The spelling of 20146865 in words is "twenty million, one hundred forty-six thousand, eight hundred sixty-five".