20181472 has 24 divisors (see below), whose sum is σ = 40329576. Its totient is φ = 9939072.

The previous prime is 20181463. The next prime is 20181479. The reversal of 20181472 is 27418102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181479) 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 3 ways as a sum of consecutive naturals, for example, 2563 + ... + 6850.

It is an arithmetic number, because the mean of its divisors is an integer number (1680399).

Almost surely, 2^20181472 is an apocalyptic number.

It is an amenable number.

20181472 is a deficient number, since it is larger than the sum of its proper divisors (20148104).

20181472 is an equidigital number, since it uses as much as digits as its factorization.

20181472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9490 (or 9482 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20181472 is about 4492.3793250348. The cubic root of 20181472 is about 272.2602756620.

Adding to 20181472 its reverse (27418102), we get a palindrome (47599574).

The spelling of 20181472 in words is "twenty million, one hundred eighty-one thousand, four hundred seventy-two".