20201563 has 2 divisors, whose sum is σ = 20201564. Its totient is φ = 20201562.

The previous prime is 20201557. The next prime is 20201651. The reversal of 20201563 is 36510202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20201563.

It is not a weakly prime, because it can be changed into another prime (20201543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100781 + 10100782.

It is an arithmetic number, because the mean of its divisors is an integer number (10100782).

Almost surely, 2^20201563 is an apocalyptic number.

20201563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201563 is an equidigital number, since it uses as much as digits as its factorization.

20201563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20201563 is about 4494.6148889532. The cubic root of 20201563 is about 272.3505922826.

Adding to 20201563 its reverse (36510202), we get a palindrome (56711765).

The spelling of 20201563 in words is "twenty million, two hundred one thousand, five hundred sixty-three".