20096821 has 2 divisors, whose sum is σ = 20096822. Its totient is φ = 20096820.

The previous prime is 20096819. The next prime is 20096831. The reversal of 20096821 is 12869002.

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., 18748900 + 1347921 = 4330^2 + 1161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20096821 - 2¹ = 20096819 is a prime.

Together with 20096819, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20096821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20096801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10048410 + 10048411.

It is an arithmetic number, because the mean of its divisors is an integer number (10048411).

Almost surely, 2^20096821 is an apocalyptic number.

It is an amenable number.

20096821 is a deficient number, since it is larger than the sum of its proper divisors (1).

20096821 is an equidigital number, since it uses as much as digits as its factorization.

20096821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20096821 is about 4482.9478025067. The cubic root of 20096821 is about 271.8790777739.

The spelling of 20096821 in words is "twenty million, ninety-six thousand, eight hundred twenty-one".