20203131031217 has 2 divisors, whose sum is σ = 20203131031218. Its totient is φ = 20203131031216.

The previous prime is 20203131031183. The next prime is 20203131031231. The reversal of 20203131031217 is 71213013130202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18938171943601 + 1264959087616 = 4351801^2 + 1124704^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203131031217 - 2¹⁶ = 20203130965681 is a prime.

It is not a weakly prime, because it can be changed into another prime (20203131031267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101565515608 + 10101565515609.

It is an arithmetic number, because the mean of its divisors is an integer number (10101565515609).

Almost surely, 2^{20203131031217} is an apocalyptic number.

It is an amenable number.

20203131031217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203131031217 is an equidigital number, since it uses as much as digits as its factorization.

20203131031217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 20203131031217 its reverse (71213013130202), we get a palindrome (91416144161419).

The spelling of 20203131031217 in words is "twenty trillion, two hundred three billion, one hundred thirty-one million, thirty-one thousand, two hundred seventeen".