20001223897 has 2 divisors, whose sum is σ = 20001223898. Its totient is φ = 20001223896.

The previous prime is 20001223859. The next prime is 20001223919. The reversal of 20001223897 is 79832210002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17578517056 + 2422706841 = 132584^2 + 49221^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001223897 - 2³¹ = 17853740249 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001223997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000611948 + 10000611949.

It is an arithmetic number, because the mean of its divisors is an integer number (10000611949).

Almost surely, 2^20001223897 is an apocalyptic number.

It is an amenable number.

20001223897 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001223897 is an equidigital number, since it uses as much as digits as its factorization.

20001223897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

Adding to 20001223897 its reverse (79832210002), we get a palindrome (99833433899).

The spelling of 20001223897 in words is "twenty billion, one million, two hundred twenty-three thousand, eight hundred ninety-seven".