20407144 has 16 divisors (see below), whose sum is σ = 38405700. Its totient is φ = 10165632.

The previous prime is 20407129. The next prime is 20407181. The reversal of 20407144 is 44170402.

It can be written as a sum of positive squares in 2 ways, for example, as 17724100 + 2683044 = 4210^2 + 1638^2 .

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, 2389 + ... + 6820.

Almost surely, 2^20407144 is an apocalyptic number.

It is an amenable number.

20407144 is a deficient number, since it is larger than the sum of its proper divisors (17998556).

20407144 is a wasteful number, since it uses less digits than its factorization.

20407144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492 (or 9488 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20407144 is about 4517.4267011209. The cubic root of 20407144 is about 273.2713336806.

Adding to 20407144 its reverse (44170402), we get a palindrome (64577546).

The spelling of 20407144 in words is "twenty million, four hundred seven thousand, one hundred forty-four".