20543144 has 32 divisors (see below), whose sum is σ = 39424320. Its totient is φ = 10033536.

The previous prime is 20543143. The next prime is 20543167. The reversal of 20543144 is 44134502.

It is not an unprimeable number, because it can be changed into a prime (20543141) 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 7 ways as a sum of consecutive naturals, for example, 88052 + ... + 88284.

It is an arithmetic number, because the mean of its divisors is an integer number (1232010).

Almost surely, 2^20543144 is an apocalyptic number.

It is an amenable number.

20543144 is a deficient number, since it is larger than the sum of its proper divisors (18881176).

20543144 is a wasteful number, since it uses less digits than its factorization.

20543144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20543144 is about 4532.4545226621. The cubic root of 20543144 is about 273.8770471493.

Adding to 20543144 its reverse (44134502), we get a palindrome (64677646).

The spelling of 20543144 in words is "twenty million, five hundred forty-three thousand, one hundred forty-four".