20955128 has 8 divisors (see below), whose sum is σ = 39290880. Its totient is φ = 10477560.

The previous prime is 20955113. The next prime is 20955133. The reversal of 20955128 is 82155902.

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 = 20955094 and 20955103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1309688 + ... + 1309703.

It is an arithmetic number, because the mean of its divisors is an integer number (4911360).

Almost surely, 2^20955128 is an apocalyptic number.

It is an amenable number.

20955128 is a deficient number, since it is larger than the sum of its proper divisors (18335752).

20955128 is a wasteful number, since it uses less digits than its factorization.

20955128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619397 (or 2619393 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20955128 is about 4577.6771402099. The cubic root of 20955128 is about 275.6957720407.

The spelling of 20955128 in words is "twenty million, nine hundred fifty-five thousand, one hundred twenty-eight".