20552563 has 2 divisors, whose sum is σ = 20552564. Its totient is φ = 20552562.

The previous prime is 20552557. The next prime is 20552579. The reversal of 20552563 is 36525502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20552563 - 2⁵ = 20552531 is a prime.

It is not a weakly prime, because it can be changed into another prime (20552513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276281 + 10276282.

It is an arithmetic number, because the mean of its divisors is an integer number (10276282).

Almost surely, 2^20552563 is an apocalyptic number.

20552563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20552563 is an equidigital number, since it uses as much as digits as its factorization.

20552563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 20552563 is about 4533.4934653091. The cubic root of 20552563 is about 273.9188981557.

It can be divided in two parts, 20552 and 563, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20552563 in words is "twenty million, five hundred fifty-two thousand, five hundred sixty-three".