20641544 has 48 divisors (see below), whose sum is σ = 49124880. Its totient is φ = 8040480.

The previous prime is 20641541. The next prime is 20641559. The reversal of 20641544 is 44514602.

It is not an unprimeable number, because it can be changed into a prime (20641541) 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 11 ways as a sum of consecutive naturals, for example, 1919 + ... + 6705.

It is an arithmetic number, because the mean of its divisors is an integer number (1023435).

Almost surely, 2^20641544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20641544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24562440).

20641544 is an abundant number, since it is smaller than the sum of its proper divisors (28483336).

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

20641544 is a wasteful number, since it uses less digits than its factorization.

20641544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4818 (or 4807 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 20641544 is about 4543.2966004874. The cubic root of 20641544 is about 274.3136337941.

The spelling of 20641544 in words is "twenty million, six hundred forty-one thousand, five hundred forty-four".