20881349 has 2 divisors, whose sum is σ = 20881350. Its totient is φ = 20881348.

The previous prime is 20881331. The next prime is 20881369. The reversal of 20881349 is 94318802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 4761124 = 4015^2 + 2182^2 .

It is a cyclic number.

It is not a de Polignac number, because 20881349 - 2¹² = 20877253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20881319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10440674 + 10440675.

It is an arithmetic number, because the mean of its divisors is an integer number (10440675).

Almost surely, 2^20881349 is an apocalyptic number.

It is an amenable number.

20881349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20881349 is an equidigital number, since it uses as much as digits as its factorization.

20881349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20881349 is about 4569.6114714492. The cubic root of 20881349 is about 275.3718341974.

The spelling of 20881349 in words is "twenty million, eight hundred eighty-one thousand, three hundred forty-nine".