20420042231383 has 2 divisors, whose sum is σ = 20420042231384. Its totient is φ = 20420042231382.

The previous prime is 20420042231363. The next prime is 20420042231417. The reversal of 20420042231383 is 38313224002402.

It is an a-pointer prime, because the next prime (20420042231417) can be obtained adding 20420042231383 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20420042231383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420042231353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210021115691 + 10210021115692.

It is an arithmetic number, because the mean of its divisors is an integer number (10210021115692).

Almost surely, 2^{20420042231383} is an apocalyptic number.

20420042231383 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420042231383 is an equidigital number, since it uses as much as digits as its factorization.

20420042231383 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 20420042231383 its reverse (38313224002402), we get a palindrome (58733266233785).

The spelling of 20420042231383 in words is "twenty trillion, four hundred twenty billion, forty-two million, two hundred thirty-one thousand, three hundred eighty-three".