20006544 has 40 divisors (see below), whose sum is σ = 54406240. Its totient is φ = 6317568.

The previous prime is 20006543. The next prime is 20006551. The reversal of 20006544 is 44560002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20006544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10057 + ... + 11880.

It is an arithmetic number, because the mean of its divisors is an integer number (1360156).

Almost surely, 2^20006544 is an apocalyptic number.

20006544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20006544 is an abundant number, since it is smaller than the sum of its proper divisors (34399696).

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

20006544 is a wasteful number, since it uses less digits than its factorization.

20006544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21967 (or 21961 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20006544 is about 4472.8675366033. The cubic root of 20006544 is about 271.4713636793.

Adding to 20006544 its reverse (44560002), we get a palindrome (64566546).

The spelling of 20006544 in words is "twenty million, six thousand, five hundred forty-four".