20681472 has 72 divisors (see below), whose sum is σ = 62922496. Its totient is φ = 5907456.

The previous prime is 20681471. The next prime is 20681477. The reversal of 20681472 is 27418602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681471) 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, 3453 + ... + 7299.

Almost surely, 2^20681472 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 20681472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31461248).

20681472 is an abundant number, since it is smaller than the sum of its proper divisors (42241024).

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

20681472 is an equidigital number, since it uses as much as digits as its factorization.

20681472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873 (or 3859 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20681472 is about 4547.6886436958. The cubic root of 20681472 is about 274.4903928609.

The spelling of 20681472 in words is "twenty million, six hundred eighty-one thousand, four hundred seventy-two".