20881319 has 2 divisors, whose sum is σ = 20881320. Its totient is φ = 20881318.

The previous prime is 20881303. The next prime is 20881331. The reversal of 20881319 is 91318802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20881319 - 2⁴ = 20881303 is a prime.

It is a super-2 number, since 2×20881319² = 872058966359522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20881349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10440659 + 10440660.

It is an arithmetic number, because the mean of its divisors is an integer number (10440660).

Almost surely, 2^20881319 is an apocalyptic number.

20881319 is a deficient number, since it is larger than the sum of its proper divisors (1).

20881319 is an equidigital number, since it uses as much as digits as its factorization.

20881319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 20881319 is about 4569.6081888932. The cubic root of 20881319 is about 275.3717023228.

The spelling of 20881319 in words is "twenty million, eight hundred eighty-one thousand, three hundred nineteen".