20486881 has 4 divisors (see below), whose sum is σ = 20514564. Its totient is φ = 20459200.

The previous prime is 20486861. The next prime is 20486891. The reversal of 20486881 is 18868402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10144225 + 10342656 = 3185^2 + 3216^2 .

It is a cyclic number.

It is not a de Polignac number, because 20486881 - 2¹¹ = 20484833 is a prime.

It is a super-4 number, since 4×20486881⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20486881.

It is not an unprimeable number, because it can be changed into a prime (20486831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12700 + ... + 14221.

It is an arithmetic number, because the mean of its divisors is an integer number (5128641).

Almost surely, 2^20486881 is an apocalyptic number.

It is an amenable number.

20486881 is a deficient number, since it is larger than the sum of its proper divisors (27683).

20486881 is an equidigital number, since it uses as much as digits as its factorization.

20486881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27682.

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 20486881 is about 4526.2435860214. The cubic root of 20486881 is about 273.6267895593.

The spelling of 20486881 in words is "twenty million, four hundred eighty-six thousand, eight hundred eighty-one".