20543472 has 60 divisors (see below), whose sum is σ = 57886920. Its totient is φ = 6801024.

The previous prime is 20543459. The next prime is 20543477. The reversal of 20543472 is 27434502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25378 + ... + 26174.

It is an arithmetic number, because the mean of its divisors is an integer number (964782).

Almost surely, 2^20543472 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 20543472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28943460).

20543472 is an abundant number, since it is smaller than the sum of its proper divisors (37343448).

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

20543472 is a wasteful number, since it uses less digits than its factorization.

20543472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 20543472 is about 4532.4907060026. The cubic root of 20543472 is about 273.8785047515.

Adding to 20543472 its reverse (27434502), we get a palindrome (47977974).

The spelling of 20543472 in words is "twenty million, five hundred forty-three thousand, four hundred seventy-two".