20848381 has 2 divisors, whose sum is σ = 20848382. Its totient is φ = 20848380.

The previous prime is 20848379. The next prime is 20848393. The reversal of 20848381 is 18384802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20848356 + 25 = 4566^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 20848381 - 2¹ = 20848379 is a prime.

It is a super-2 number, since 2×20848381² = 869309980642322, which contains 22 as substring.

Together with 20848379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20848081) 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, 10424190 + 10424191.

It is an arithmetic number, because the mean of its divisors is an integer number (10424191).

Almost surely, 2^20848381 is an apocalyptic number.

It is an amenable number.

20848381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20848381 is an equidigital number, since it uses as much as digits as its factorization.

20848381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 20848381 is about 4566.0027376251. The cubic root of 20848381 is about 275.2268365316.

The spelling of 20848381 in words is "twenty million, eight hundred forty-eight thousand, three hundred eighty-one".