20867328 has 72 divisors (see below), whose sum is σ = 61728800. Its totient is φ = 6953472.

The previous prime is 20867317. The next prime is 20867333. The reversal of 20867328 is 82376802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20867292 and 20867301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5403 + ... + 8421.

Almost surely, 2^20867328 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 20867328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30864400).

20867328 is an abundant number, since it is smaller than the sum of its proper divisors (40861472).

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

20867328 is an equidigital number, since it uses as much as digits as its factorization.

20867328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044 (or 3024 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20867328 is about 4568.0770571434. The cubic root of 20867328 is about 275.3101866321.

The spelling of 20867328 in words is "twenty million, eight hundred sixty-seven thousand, three hundred twenty-eight".