20355128 has 8 divisors (see below), whose sum is σ = 38165880. Its totient is φ = 10177560.

The previous prime is 20355121. The next prime is 20355133. The reversal of 20355128 is 82155302.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20355097 and 20355106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355121) by changing a digit.

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 as a sum of consecutive naturals, namely, 1272188 + ... + 1272203.

It is an arithmetic number, because the mean of its divisors is an integer number (4770735).

Almost surely, 2^20355128 is an apocalyptic number.

It is an amenable number.

20355128 is a deficient number, since it is larger than the sum of its proper divisors (17810752).

20355128 is a wasteful number, since it uses less digits than its factorization.

20355128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544397 (or 2544393 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20355128 is about 4511.6657677625. The cubic root of 20355128 is about 273.0389546670.

The spelling of 20355128 in words is "twenty million, three hundred fifty-five thousand, one hundred twenty-eight".