20881361 has 8 divisors (see below), whose sum is σ = 22022400. Its totient is φ = 19744560.

The previous prime is 20881349. The next prime is 20881369. The reversal of 20881361 is 16318802.

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

It is a cyclic number.

It is not a de Polignac number, because 20881361 - 2⁶ = 20881297 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 18275 + ... + 19383.

It is an arithmetic number, because the mean of its divisors is an integer number (2752800).

Almost surely, 2^20881361 is an apocalyptic number.

It is an amenable number.

20881361 is a deficient number, since it is larger than the sum of its proper divisors (1141039).

20881361 is a wasteful number, since it uses less digits than its factorization.

20881361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20881361 is about 4569.6127844709. The cubic root of 20881361 is about 275.3718869472.

The spelling of 20881361 in words is "twenty million, eight hundred eighty-one thousand, three hundred sixty-one".