20728112 has 20 divisors (see below), whose sum is σ = 40298760. Its totient is φ = 10328448.

The previous prime is 20728109. The next prime is 20728121. The reversal of 20728112 is 21182702.

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, 2939 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (2014938).

Almost surely, 2^20728112 is an apocalyptic number.

It is an amenable number.

20728112 is a deficient number, since it is larger than the sum of its proper divisors (19570648).

20728112 is a wasteful number, since it uses less digits than its factorization.

20728112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460 (or 4454 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20728112 is about 4552.8136355445. The cubic root of 20728112 is about 274.6965777378.

The spelling of 20728112 in words is "twenty million, seven hundred twenty-eight thousand, one hundred twelve".