20563472 has 80 divisors (see below), whose sum is σ = 46604160. Its totient is φ = 8718336.

The previous prime is 20563471. The next prime is 20563481. The reversal of 20563472 is 27436502.

It is a super-3 number, since 3×20563472³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20563471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118778 + ... + 118950.

It is an arithmetic number, because the mean of its divisors is an integer number (582552).

Almost surely, 2^20563472 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 20563472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23302080).

20563472 is an abundant number, since it is smaller than the sum of its proper divisors (26040688).

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

20563472 is a wasteful number, since it uses less digits than its factorization.

20563472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20563472 is about 4534.6964617271. The cubic root of 20563472 is about 273.9673536326.

Adding to 20563472 its reverse (27436502), we get a palindrome (47999974).

The spelling of 20563472 in words is "twenty million, five hundred sixty-three thousand, four hundred seventy-two".