20351220022543 has 2 divisors, whose sum is σ = 20351220022544. Its totient is φ = 20351220022542.

The previous prime is 20351220022513. The next prime is 20351220022589. The reversal of 20351220022543 is 34522002215302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20351220022543 - 2²¹ = 20351217925391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20351220022513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175610011271 + 10175610011272.

It is an arithmetic number, because the mean of its divisors is an integer number (10175610011272).

Almost surely, 2^{20351220022543} is an apocalyptic number.

20351220022543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351220022543 is an equidigital number, since it uses as much as digits as its factorization.

20351220022543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 20351220022543 its reverse (34522002215302), we get a palindrome (54873222237845).

The spelling of 20351220022543 in words is "twenty trillion, three hundred fifty-one billion, two hundred twenty million, twenty-two thousand, five hundred forty-three".