20927128 has 32 divisors (see below), whose sum is σ = 40154400. Its totient is φ = 10222848.

The previous prime is 20927107. The next prime is 20927131. The reversal of 20927128 is 82172902.

It is a self number, because there is not a number n which added to its sum of digits gives 20927128.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89700 + ... + 89932.

It is an arithmetic number, because the mean of its divisors is an integer number (1254825).

Almost surely, 2^20927128 is an apocalyptic number.

It is an amenable number.

20927128 is a deficient number, since it is larger than the sum of its proper divisors (19227272).

20927128 is a wasteful number, since it uses less digits than its factorization.

20927128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20927128 is about 4574.6177982428. The cubic root of 20927128 is about 275.5729234727.

The spelling of 20927128 in words is "twenty million, nine hundred twenty-seven thousand, one hundred twenty-eight".