20221328 has 20 divisors (see below), whose sum is σ = 39266460. Its totient is φ = 10088064.

The previous prime is 20221319. The next prime is 20221343. The reversal of 20221328 is 82312202.

It can be written as a sum of positive squares in 2 ways, for example, as 1281424 + 18939904 = 1132^2 + 4352^2 .

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, 7778 + ... + 10046.

It is an arithmetic number, because the mean of its divisors is an integer number (1963323).

Almost surely, 2^20221328 is an apocalyptic number.

It is an amenable number.

20221328 is a deficient number, since it is larger than the sum of its proper divisors (19045132).

20221328 is a wasteful number, since it uses less digits than its factorization.

20221328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834 (or 2828 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20221328 is about 4496.8130937365. The cubic root of 20221328 is about 272.4393849971.

The spelling of 20221328 in words is "twenty million, two hundred twenty-one thousand, three hundred twenty-eight".