20250728 has 16 divisors (see below), whose sum is σ = 38076000. Its totient is φ = 10097136.

The previous prime is 20250707. The next prime is 20250733. The reversal of 20250728 is 82705202.

It is a junction number, because it is equal to n+sod(n) for n = 20250697 and 20250706.

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, 308 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (2379750).

Almost surely, 2^20250728 is an apocalyptic number.

It is an amenable number.

20250728 is a deficient number, since it is larger than the sum of its proper divisors (17825272).

20250728 is a wasteful number, since it uses less digits than its factorization.

20250728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7064 (or 7060 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 20250728 is about 4500.0808881619. The cubic root of 20250728 is about 272.5713552160.

The spelling of 20250728 in words is "twenty million, two hundred fifty thousand, seven hundred twenty-eight".