20144493 has 6 divisors (see below), whose sum is σ = 29097614. Its totient is φ = 13429656.

The previous prime is 20144479. The next prime is 20144497. The reversal of 20144493 is 39444102.

It can be written as a sum of positive squares in only one way, i.e., 20088324 + 56169 = 4482^2 + 237^2 .

It is not a de Polignac number, because 20144493 - 2⁵ = 20144461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144497) 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 5 ways as a sum of consecutive naturals, for example, 1119130 + ... + 1119147.

Almost surely, 2^20144493 is an apocalyptic number.

It is an amenable number.

20144493 is a deficient number, since it is larger than the sum of its proper divisors (8953121).

20144493 is a wasteful number, since it uses less digits than its factorization.

20144493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238283 (or 2238280 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20144493 is about 4488.2616902315. The cubic root of 20144493 is about 272.0938842936.

Adding to 20144493 its reverse (39444102), we get a palindrome (59588595).

The spelling of 20144493 in words is "twenty million, one hundred forty-four thousand, four hundred ninety-three".