20447328 has 144 divisors (see below), whose sum is σ = 63129024. Its totient is φ = 5744640.

The previous prime is 20447293. The next prime is 20447341. The reversal of 20447328 is 82374402.

It is a junction number, because it is equal to n+sod(n) for n = 20447295 and 20447304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305151 + ... + 305217.

It is an arithmetic number, because the mean of its divisors is an integer number (438396).

Almost surely, 2^20447328 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 20447328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31564512).

20447328 is an abundant number, since it is smaller than the sum of its proper divisors (42681696).

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

20447328 is a wasteful number, since it uses less digits than its factorization.

20447328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20447328 is about 4521.8721786446. The cubic root of 20447328 is about 273.4505835786.

The spelling of 20447328 in words is "twenty million, four hundred forty-seven thousand, three hundred twenty-eight".