20405420103193 has 2 divisors, whose sum is σ = 20405420103194. Its totient is φ = 20405420103192.

The previous prime is 20405420103161. The next prime is 20405420103253. The reversal of 20405420103193 is 39130102450402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14610986394624 + 5794433708569 = 3822432^2 + 2407163^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405420103193 - 2⁵ = 20405420103161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20405420103113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202710051596 + 10202710051597.

It is an arithmetic number, because the mean of its divisors is an integer number (10202710051597).

Almost surely, 2^{20405420103193} is an apocalyptic number.

It is an amenable number.

20405420103193 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405420103193 is an equidigital number, since it uses as much as digits as its factorization.

20405420103193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 20405420103193 its reverse (39130102450402), we get a palindrome (59535522553595).

The spelling of 20405420103193 in words is "twenty trillion, four hundred five billion, four hundred twenty million, one hundred three thousand, one hundred ninety-three".