20581472 has 24 divisors (see below), whose sum is σ = 41617296. Its totient is φ = 10012032.

The previous prime is 20581471. The next prime is 20581499. The reversal of 20581472 is 27418502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7508 + ... + 9875.

It is an arithmetic number, because the mean of its divisors is an integer number (1734054).

Almost surely, 2^20581472 is an apocalyptic number.

It is an amenable number.

20581472 is an abundant number, since it is smaller than the sum of its proper divisors (21035824).

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

20581472 is a wasteful number, since it uses less digits than its factorization.

20581472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17430 (or 17422 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20581472 is about 4536.6807249354. The cubic root of 20581472 is about 274.0472683827.

Adding to 20581472 its reverse (27418502), we get a palindrome (47999974).

The spelling of 20581472 in words is "twenty million, five hundred eighty-one thousand, four hundred seventy-two".