20826563 has 2 divisors, whose sum is σ = 20826564. Its totient is φ = 20826562.

The previous prime is 20826557. The next prime is 20826571. The reversal of 20826563 is 36562802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20826563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20826163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413281 + 10413282.

It is an arithmetic number, because the mean of its divisors is an integer number (10413282).

Almost surely, 2^20826563 is an apocalyptic number.

20826563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826563 is an equidigital number, since it uses as much as digits as its factorization.

20826563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 20826563 is about 4563.6129327540. The cubic root of 20826563 is about 275.1307939810.

The spelling of 20826563 in words is "twenty million, eight hundred twenty-six thousand, five hundred sixty-three".