20881149 has 4 divisors (see below), whose sum is σ = 27841536. Its totient is φ = 13920764.

The previous prime is 20881141. The next prime is 20881163. The reversal of 20881149 is 94118802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20881149 - 2³ = 20881141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881141) 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, 3480189 + ... + 3480194.

It is an arithmetic number, because the mean of its divisors is an integer number (6960384).

Almost surely, 2^20881149 is an apocalyptic number.

It is an amenable number.

20881149 is a deficient number, since it is larger than the sum of its proper divisors (6960387).

20881149 is an equidigital number, since it uses as much as digits as its factorization.

20881149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6960386.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 20881149 is about 4569.5895876982. The cubic root of 20881149 is about 275.3709550310.

The spelling of 20881149 in words is "twenty million, eight hundred eighty-one thousand, one hundred forty-nine".