20128455 has 48 divisors (see below), whose sum is σ = 36900864. Its totient is φ = 10134720.

The previous prime is 20128453. The next prime is 20128469. The reversal of 20128455 is 55482102.

It is a happy number.

20128455 is a `hidden beast` number, since 201 + 2 + 8 + 455 = 666.

It is not a de Polignac number, because 20128455 - 2¹ = 20128453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128453) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65412 + ... + 65718.

It is an arithmetic number, because the mean of its divisors is an integer number (768768).

Almost surely, 2^20128455 is an apocalyptic number.

20128455 is a deficient number, since it is larger than the sum of its proper divisors (16772409).

20128455 is a wasteful number, since it uses less digits than its factorization.

20128455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 20128455 is about 4486.4746739506. The cubic root of 20128455 is about 272.0216561117.

The spelling of 20128455 in words is "twenty million, one hundred twenty-eight thousand, four hundred fifty-five".