20550128 has 10 divisors (see below), whose sum is σ = 39815904. Its totient is φ = 10275056.

The previous prime is 20550121. The next prime is 20550199. The reversal of 20550128 is 82105502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642176 + ... + 642207.

Almost surely, 2^20550128 is an apocalyptic number.

It is an amenable number.

20550128 is a deficient number, since it is larger than the sum of its proper divisors (19265776).

20550128 is a wasteful number, since it uses less digits than its factorization.

20550128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284391 (or 1284385 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20550128 is about 4533.2249006640. The cubic root of 20550128 is about 273.9080800587.

The spelling of 20550128 in words is "twenty million, five hundred fifty thousand, one hundred twenty-eight".