20347274155517 has 2 divisors, whose sum is σ = 20347274155518. Its totient is φ = 20347274155516.

The previous prime is 20347274155477. The next prime is 20347274155541. The reversal of 20347274155517 is 71555147274302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18499452607801 + 1847821547716 = 4301099^2 + 1359346^2 .

It is a cyclic number.

It is not a de Polignac number, because 20347274155517 - 2¹⁴ = 20347274139133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20347274154517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173637077758 + 10173637077759.

It is an arithmetic number, because the mean of its divisors is an integer number (10173637077759).

Almost surely, 2^{20347274155517} is an apocalyptic number.

It is an amenable number.

20347274155517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20347274155517 is an equidigital number, since it uses as much as digits as its factorization.

20347274155517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232000, while the sum is 53.

The spelling of 20347274155517 in words is "twenty trillion, three hundred forty-seven billion, two hundred seventy-four million, one hundred fifty-five thousand, five hundred seventeen".