20645827 has 2 divisors, whose sum is σ = 20645828. Its totient is φ = 20645826.

The previous prime is 20645813. The next prime is 20645839. The reversal of 20645827 is 72854602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20645827 - 2¹⁹ = 20121539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20645792 and 20645801.

It is not a weakly prime, because it can be changed into another prime (20645857) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322913 + 10322914.

It is an arithmetic number, because the mean of its divisors is an integer number (10322914).

Almost surely, 2^20645827 is an apocalyptic number.

20645827 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645827 is an equidigital number, since it uses as much as digits as its factorization.

20645827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 20645827 is about 4543.7679298133. The cubic root of 20645827 is about 274.3326053084.

The spelling of 20645827 in words is "twenty million, six hundred forty-five thousand, eight hundred twenty-seven".