20346665402381 has 2 divisors, whose sum is σ = 20346665402382. Its totient is φ = 20346665402380.

The previous prime is 20346665402369. The next prime is 20346665402407. The reversal of 20346665402381 is 18320456664302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20214609476356 + 132055926025 = 4496066^2 + 363395^2 .

It is a cyclic number.

It is not a de Polignac number, because 20346665402381 - 2³⁰ = 20345591660557 is a prime.

It is a super-2 number, since 2×20346665402381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20346665402081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173332701190 + 10173332701191.

It is an arithmetic number, because the mean of its divisors is an integer number (10173332701191).

Almost surely, 2^{20346665402381} is an apocalyptic number.

It is an amenable number.

20346665402381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20346665402381 is an equidigital number, since it uses as much as digits as its factorization.

20346665402381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 50.

The spelling of 20346665402381 in words is "twenty trillion, three hundred forty-six billion, six hundred sixty-five million, four hundred two thousand, three hundred eighty-one".