20289472 has 28 divisors (see below), whose sum is σ = 46014640. Its totient is φ = 8695296.

The previous prime is 20289463. The next prime is 20289497. The reversal of 20289472 is 27498202.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22197 + ... + 23092.

It is an arithmetic number, because the mean of its divisors is an integer number (1643380).

Almost surely, 2^20289472 is an apocalyptic number.

It is an amenable number.

20289472 is an abundant number, since it is smaller than the sum of its proper divisors (25725168).

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

20289472 is an equidigital number, since it uses as much as digits as its factorization.

20289472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45308 (or 45298 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20289472 is about 4504.3836426308. The cubic root of 20289472 is about 272.7450736933.

The spelling of 20289472 in words is "twenty million, two hundred eighty-nine thousand, four hundred seventy-two".