20340821606393 has 2 divisors, whose sum is σ = 20340821606394. Its totient is φ = 20340821606392.

The previous prime is 20340821606383. The next prime is 20340821606401. The reversal of 20340821606393 is 39360612804302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19496348828089 + 844472778304 = 4415467^2 + 918952^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20340821606393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20340821606383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170410803196 + 10170410803197.

It is an arithmetic number, because the mean of its divisors is an integer number (10170410803197).

Almost surely, 2^{20340821606393} is an apocalyptic number.

It is an amenable number.

20340821606393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340821606393 is an equidigital number, since it uses as much as digits as its factorization.

20340821606393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 20340821606393 in words is "twenty trillion, three hundred forty billion, eight hundred twenty-one million, six hundred six thousand, three hundred ninety-three".