20001215567 has 2 divisors, whose sum is σ = 20001215568. Its totient is φ = 20001215566.

The previous prime is 20001215539. The next prime is 20001215573. The reversal of 20001215567 is 76551210002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001215567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001215867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000607783 + 10000607784.

It is an arithmetic number, because the mean of its divisors is an integer number (10000607784).

Almost surely, 2^20001215567 is an apocalyptic number.

20001215567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001215567 is an equidigital number, since it uses as much as digits as its factorization.

20001215567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 20001215567 its reverse (76551210002), we get a palindrome (96552425569).

The spelling of 20001215567 in words is "twenty billion, one million, two hundred fifteen thousand, five hundred sixty-seven".