20144665 has 16 divisors (see below), whose sum is σ = 25660800. Its totient is φ = 15148672.

The previous prime is 20144659. The next prime is 20144671. The reversal of 20144665 is 56644102.

It is an interprime number because it is at equal distance from previous prime (20144659) and next prime (20144671).

It is a cyclic number.

It is not a de Polignac number, because 20144665 - 2⁵ = 20144633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5301 + ... + 8269.

It is an arithmetic number, because the mean of its divisors is an integer number (1603800).

Almost surely, 2^20144665 is an apocalyptic number.

It is an amenable number.

20144665 is a deficient number, since it is larger than the sum of its proper divisors (5516135).

20144665 is a wasteful number, since it uses less digits than its factorization.

20144665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056.

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

The square root of 20144665 is about 4488.2808512837. The cubic root of 20144665 is about 272.0946586991.

Adding to 20144665 its reverse (56644102), we get a palindrome (76788767).

The spelling of 20144665 in words is "twenty million, one hundred forty-four thousand, six hundred sixty-five".