20544100 has 18 divisors (see below), whose sum is σ = 44580914. Its totient is φ = 8217600.

The previous prime is 20544089. The next prime is 20544101. The reversal of 20544100 is 144502.

It can be written as a sum of positive squares in 3 ways, for example, as 401956 + 20142144 = 634^2 + 4488^2 .

It is not an unprimeable number, because it can be changed into a prime (20544101) 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, 102621 + ... + 102820.

Almost surely, 2^20544100 is an apocalyptic number.

20544100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20544100 is an abundant number, since it is smaller than the sum of its proper divisors (24036814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20544100 is a wasteful number, since it uses less digits than its factorization.

20544100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205455 (or 205448 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20544100 is about 4532.5599830559. The cubic root of 20544100 is about 273.8812954831.

Adding to 20544100 its reverse (144502), we get a palindrome (20688602).

The spelling of 20544100 in words is "twenty million, five hundred forty-four thousand, one hundred".