20548881 has 12 divisors (see below), whose sum is σ = 29755908. Its totient is φ = 13665024.

The previous prime is 20548859. The next prime is 20548889. The reversal of 20548881 is 18884502.

It can be written as a sum of positive squares in 2 ways, for example, as 5803281 + 14745600 = 2409^2 + 3840^2 .

It is not a de Polignac number, because 20548881 - 2⁶ = 20548817 is a prime.

It is a super-2 number, since 2×20548881² = 844513020704322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20548889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1261 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (2479659).

Almost surely, 2^20548881 is an apocalyptic number.

It is an amenable number.

20548881 is a deficient number, since it is larger than the sum of its proper divisors (9207027).

20548881 is a wasteful number, since it uses less digits than its factorization.

20548881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712 (or 5709 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 20548881 is about 4533.0873585229. The cubic root of 20548881 is about 273.9025396182.

The spelling of 20548881 in words is "twenty million, five hundred forty-eight thousand, eight hundred eighty-one".