20670563 has 2 divisors, whose sum is σ = 20670564. Its totient is φ = 20670562.

The previous prime is 20670557. The next prime is 20670577. The reversal of 20670563 is 36507602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20670563 - 2⁴ = 20670547 is a prime.

It is not a weakly prime, because it can be changed into another prime (20670523) 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, 10335281 + 10335282.

It is an arithmetic number, because the mean of its divisors is an integer number (10335282).

Almost surely, 2^20670563 is an apocalyptic number.

20670563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670563 is an equidigital number, since it uses as much as digits as its factorization.

20670563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 20670563 is about 4546.4890849973. The cubic root of 20670563 is about 274.4421219199.

The spelling of 20670563 in words is "twenty million, six hundred seventy thousand, five hundred sixty-three".