20500217407 has 2 divisors, whose sum is σ = 20500217408. Its totient is φ = 20500217406.

The previous prime is 20500217383. The next prime is 20500217453. The reversal of 20500217407 is 70471200502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20500217407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20500217497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250108703 + 10250108704.

It is an arithmetic number, because the mean of its divisors is an integer number (10250108704).

Almost surely, 2^20500217407 is an apocalyptic number.

20500217407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500217407 is an equidigital number, since it uses as much as digits as its factorization.

20500217407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 28.

Adding to 20500217407 its reverse (70471200502), we get a palindrome (90971417909).

The spelling of 20500217407 in words is "twenty billion, five hundred million, two hundred seventeen thousand, four hundred seven".