20540144 has 10 divisors (see below), whose sum is σ = 39796560. Its totient is φ = 10270064.

The previous prime is 20540141. The next prime is 20540161. The reversal of 20540144 is 44104502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540141) 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 as a sum of consecutive naturals, namely, 641864 + ... + 641895.

It is an arithmetic number, because the mean of its divisors is an integer number (3979656).

Almost surely, 2^20540144 is an apocalyptic number.

It is an amenable number.

20540144 is a deficient number, since it is larger than the sum of its proper divisors (19256416).

20540144 is a wasteful number, since it uses less digits than its factorization.

20540144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283767 (or 1283761 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20540144 is about 4532.1235640702. The cubic root of 20540144 is about 273.8637147023.

Adding to 20540144 its reverse (44104502), we get a palindrome (64644646).

The spelling of 20540144 in words is "twenty million, five hundred forty thousand, one hundred forty-four".