20217413647 has 2 divisors, whose sum is σ = 20217413648. Its totient is φ = 20217413646.

The previous prime is 20217413633. The next prime is 20217413653. The reversal of 20217413647 is 74631471202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20217413647 - 2⁷ = 20217413519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20217413627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108706823 + 10108706824.

It is an arithmetic number, because the mean of its divisors is an integer number (10108706824).

Almost surely, 2^20217413647 is an apocalyptic number.

20217413647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20217413647 is an equidigital number, since it uses as much as digits as its factorization.

20217413647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

Adding to 20217413647 its reverse (74631471202), we get a palindrome (94848884849).

The spelling of 20217413647 in words is "twenty billion, two hundred seventeen million, four hundred thirteen thousand, six hundred forty-seven".