20312541217 has 2 divisors, whose sum is σ = 20312541218. Its totient is φ = 20312541216.

The previous prime is 20312541203. The next prime is 20312541233. The reversal of 20312541217 is 71214521302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12126634641 + 8185906576 = 110121^2 + 90476^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312541217 - 2¹⁵ = 20312508449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20312941217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156270608 + 10156270609.

It is an arithmetic number, because the mean of its divisors is an integer number (10156270609).

Almost surely, 2^20312541217 is an apocalyptic number.

It is an amenable number.

20312541217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312541217 is an equidigital number, since it uses as much as digits as its factorization.

20312541217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 20312541217 in words is "twenty billion, three hundred twelve million, five hundred forty-one thousand, two hundred seventeen".