20404544 has 28 divisors (see below), whose sum is σ = 40709088. Its totient is φ = 10147200.

The previous prime is 20404493. The next prime is 20404547. The reversal of 20404544 is 44540402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404547) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12749 + ... + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (1453896).

Almost surely, 2^20404544 is an apocalyptic number.

It is an amenable number.

20404544 is a deficient number, since it is larger than the sum of its proper divisors (20304544).

20404544 is a wasteful number, since it uses less digits than its factorization.

20404544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 20404544 is about 4517.1389175008. The cubic root of 20404544 is about 273.2597276854.

Adding to 20404544 its reverse (44540402), we get a palindrome (64944946).

The spelling of 20404544 in words is "twenty million, four hundred four thousand, five hundred forty-four".