20838938543 has 2 divisors, whose sum is σ = 20838938544. Its totient is φ = 20838938542.

The previous prime is 20838938459. The next prime is 20838938563. The reversal of 20838938543 is 34583983802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20838938543 - 2¹⁶ = 20838873007 is a prime.

It is a super-2 number, since 2×20838938543² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20838938563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419469271 + 10419469272.

It is an arithmetic number, because the mean of its divisors is an integer number (10419469272).

Almost surely, 2^20838938543 is an apocalyptic number.

20838938543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20838938543 is an equidigital number, since it uses as much as digits as its factorization.

20838938543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 20838938543 in words is "twenty billion, eight hundred thirty-eight million, nine hundred thirty-eight thousand, five hundred forty-three".