20578133 has 4 divisors (see below), whose sum is σ = 20770560. Its totient is φ = 20385708.

The previous prime is 20578127. The next prime is 20578183. The reversal of 20578133 is 33187502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20578133 - 2⁸ = 20577877 is a prime.

It is a super-6 number, since 6×20578133⁶ (a number of 45 digits) contains 666666 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20578096 and 20578105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96053 + ... + 96266.

It is an arithmetic number, because the mean of its divisors is an integer number (5192640).

Almost surely, 2^20578133 is an apocalyptic number.

It is an amenable number.

20578133 is a deficient number, since it is larger than the sum of its proper divisors (192427).

20578133 is a wasteful number, since it uses less digits than its factorization.

20578133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192426.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20578133 is about 4536.3127096795. The cubic root of 20578133 is about 274.0324477175.

The spelling of 20578133 in words is "twenty million, five hundred seventy-eight thousand, one hundred thirty-three".