20841823 has 2 divisors, whose sum is σ = 20841824. Its totient is φ = 20841822.

The previous prime is 20841787. The next prime is 20841853. The reversal of 20841823 is 32814802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20841823 - 2⁹ = 20841311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20841791 and 20841800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20841853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420911 + 10420912.

It is an arithmetic number, because the mean of its divisors is an integer number (10420912).

Almost surely, 2^20841823 is an apocalyptic number.

20841823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841823 is an equidigital number, since it uses as much as digits as its factorization.

20841823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20841823 is about 4565.2845475392. The cubic root of 20841823 is about 275.1979753476.

The spelling of 20841823 in words is "twenty million, eight hundred forty-one thousand, eight hundred twenty-three".