20881360 has 20 divisors (see below), whose sum is σ = 48549348. Its totient is φ = 8352512.

The previous prime is 20881349. The next prime is 20881369. The reversal of 20881360 is 6318802.

It can be written as a sum of positive squares in 2 ways, for example, as 15178816 + 5702544 = 3896^2 + 2388^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881369) 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, 130429 + ... + 130588.

Almost surely, 2^20881360 is an apocalyptic number.

20881360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20881360 is an abundant number, since it is smaller than the sum of its proper divisors (27667988).

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

20881360 is a wasteful number, since it uses less digits than its factorization.

20881360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261030 (or 261024 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20881360 is about 4569.6126750524. The cubic root of 20881360 is about 275.3718825514.

The spelling of 20881360 in words is "twenty million, eight hundred eighty-one thousand, three hundred sixty".