20220728 has 16 divisors (see below), whose sum is σ = 41360760. Its totient is φ = 9191200.

The previous prime is 20220713. The next prime is 20220751. The reversal of 20220728 is 82702202.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 114803 + ... + 114978.

Almost surely, 2^20220728 is an apocalyptic number.

It is an amenable number.

20220728 is an abundant number, since it is smaller than the sum of its proper divisors (21140032).

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

20220728 is a wasteful number, since it uses less digits than its factorization.

20220728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229798 (or 229794 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20220728 is about 4496.7463793281. The cubic root of 20220728 is about 272.4366903959.

The spelling of 20220728 in words is "twenty million, two hundred twenty thousand, seven hundred twenty-eight".