20105402343157 has 2 divisors, whose sum is σ = 20105402343158. Its totient is φ = 20105402343156.

The previous prime is 20105402343097. The next prime is 20105402343197. The reversal of 20105402343157 is 75134320450102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18157365233316 + 1948037109841 = 4261146^2 + 1395721^2 .

It is a cyclic number.

It is not a de Polignac number, because 20105402343157 - 2⁷ = 20105402343029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20105402343197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052701171578 + 10052701171579.

It is an arithmetic number, because the mean of its divisors is an integer number (10052701171579).

Almost surely, 2^{20105402343157} is an apocalyptic number.

It is an amenable number.

20105402343157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20105402343157 is an equidigital number, since it uses as much as digits as its factorization.

20105402343157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 37.

Adding to 20105402343157 its reverse (75134320450102), we get a palindrome (95239722793259).

The spelling of 20105402343157 in words is "twenty trillion, one hundred five billion, four hundred two million, three hundred forty-three thousand, one hundred fifty-seven".