20320217387 has 2 divisors, whose sum is σ = 20320217388. Its totient is φ = 20320217386.

The previous prime is 20320217381. The next prime is 20320217431. The reversal of 20320217387 is 78371202302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20320217387 - 2¹⁴ = 20320201003 is a prime.

It is a super-2 number, since 2×20320217387² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20320217381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160108693 + 10160108694.

It is an arithmetic number, because the mean of its divisors is an integer number (10160108694).

Almost surely, 2^20320217387 is an apocalyptic number.

20320217387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320217387 is an equidigital number, since it uses as much as digits as its factorization.

20320217387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

Adding to 20320217387 its reverse (78371202302), we get a palindrome (98691419689).

The spelling of 20320217387 in words is "twenty billion, three hundred twenty million, two hundred seventeen thousand, three hundred eighty-seven".