20438463282157 has 2 divisors, whose sum is σ = 20438463282158. Its totient is φ = 20438463282156.

The previous prime is 20438463282151. The next prime is 20438463282217. The reversal of 20438463282157 is 75128236483402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16955708588361 + 3482754693796 = 4117731^2 + 1866214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20438463282157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20438463282098 and 20438463282107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20438463282151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219231641078 + 10219231641079.

It is an arithmetic number, because the mean of its divisors is an integer number (10219231641079).

Almost surely, 2^{20438463282157} is an apocalyptic number.

It is an amenable number.

20438463282157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20438463282157 is an equidigital number, since it uses as much as digits as its factorization.

20438463282157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15482880, while the sum is 55.

The spelling of 20438463282157 in words is "twenty trillion, four hundred thirty-eight billion, four hundred sixty-three million, two hundred eighty-two thousand, one hundred fifty-seven".