20536881 has 8 divisors (see below), whose sum is σ = 27487680. Its totient is φ = 13638672.

The previous prime is 20536847. The next prime is 20536889. The reversal of 20536881 is 18863502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20536881 - 2¹³ = 20528689 is a prime.

It is a super-2 number, since 2×20536881² = 843526962416322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20536889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12226 + ... + 13803.

It is an arithmetic number, because the mean of its divisors is an integer number (3435960).

Almost surely, 2^20536881 is an apocalyptic number.

It is an amenable number.

20536881 is a deficient number, since it is larger than the sum of its proper divisors (6950799).

20536881 is a wasteful number, since it uses less digits than its factorization.

20536881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26295.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20536881 is about 4531.7635640002. The cubic root of 20536881 is about 273.8492119700.

The spelling of 20536881 in words is "twenty million, five hundred thirty-six thousand, eight hundred eighty-one".