20553823 has 2 divisors, whose sum is σ = 20553824. Its totient is φ = 20553822.

The previous prime is 20553787. The next prime is 20553829. The reversal of 20553823 is 32835502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20553823 - 2¹⁷ = 20422751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20553791 and 20553800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20553829) 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, 10276911 + 10276912.

It is an arithmetic number, because the mean of its divisors is an integer number (10276912).

Almost surely, 2^20553823 is an apocalyptic number.

20553823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553823 is an equidigital number, since it uses as much as digits as its factorization.

20553823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20553823 is about 4533.6324288588. The cubic root of 20553823 is about 273.9244956857.

The spelling of 20553823 in words is "twenty million, five hundred fifty-three thousand, eight hundred twenty-three".