20147472 has 60 divisors (see below), whose sum is σ = 56769804. Its totient is φ = 6670080.

The previous prime is 20147459. The next prime is 20147483. The reversal of 20147472 is 27474102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 19501056 = 804^2 + 4416^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25678 + ... + 26450.

Almost surely, 2^20147472 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 20147472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28384902).

20147472 is an abundant number, since it is smaller than the sum of its proper divisors (36622332).

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

20147472 is a wasteful number, since it uses less digits than its factorization.

20147472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 20147472 is about 4488.5935436393. The cubic root of 20147472 is about 272.1072961928.

The spelling of 20147472 in words is "twenty million, one hundred forty-seven thousand, four hundred seventy-two".