20578128 has 40 divisors (see below), whose sum is σ = 53323968. Its totient is φ = 6838272.

The previous prime is 20578127. The next prime is 20578183. The reversal of 20578128 is 82187502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27325 + ... + 28067.

Almost surely, 2^20578128 is an apocalyptic number.

It is an amenable number.

20578128 is an abundant number, since it is smaller than the sum of its proper divisors (32745840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20578128 is a wasteful number, since it uses less digits than its factorization.

20578128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 20578128 is about 4536.3121585711. The cubic root of 20578128 is about 274.0324255230.

It can be divided in two parts, 20578 and 128, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20578128 in words is "twenty million, five hundred seventy-eight thousand, one hundred twenty-eight".