20201663 has 2 divisors, whose sum is σ = 20201664. Its totient is φ = 20201662.

The previous prime is 20201653. The next prime is 20201669. The reversal of 20201663 is 36610202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20201663 - 2⁸ = 20201407 is a prime.

It is a super-3 number, since 3×20201663³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100831 + 10100832.

It is an arithmetic number, because the mean of its divisors is an integer number (10100832).

Almost surely, 2^20201663 is an apocalyptic number.

20201663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201663 is an equidigital number, since it uses as much as digits as its factorization.

20201663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20201663 is about 4494.6260133631. The cubic root of 20201663 is about 272.3510416705.

Adding to 20201663 its reverse (36610202), we get a palindrome (56811865).

The spelling of 20201663 in words is "twenty million, two hundred one thousand, six hundred sixty-three".