20816544 has 48 divisors (see below), whose sum is σ = 62451648. Its totient is φ = 5947392.

The previous prime is 20816539. The next prime is 20816569. The reversal of 20816544 is 44561802.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14817 + ... + 16160.

It is an arithmetic number, because the mean of its divisors is an integer number (1301076).

Almost surely, 2^20816544 is an apocalyptic number.

20816544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20816544 is an abundant number, since it is smaller than the sum of its proper divisors (41635104).

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

20816544 is a wasteful number, since it uses less digits than its factorization.

20816544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30997 (or 30989 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20816544 is about 4562.5150958654. The cubic root of 20816544 is about 275.0866680000.

The spelling of 20816544 in words is "twenty million, eight hundred sixteen thousand, five hundred forty-four".