20873424181 has 2 divisors, whose sum is σ = 20873424182. Its totient is φ = 20873424180.

The previous prime is 20873424139. The next prime is 20873424199. The reversal of 20873424181 is 18142437802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20048011281 + 825412900 = 141591^2 + 28730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20873424181 - 2¹³ = 20873415989 is a prime.

It is a super-2 number, since 2×20873424181² (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 (20873424581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10436712090 + 10436712091.

It is an arithmetic number, because the mean of its divisors is an integer number (10436712091).

Almost surely, 2^20873424181 is an apocalyptic number.

It is an amenable number.

20873424181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20873424181 is an equidigital number, since it uses as much as digits as its factorization.

20873424181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 20873424181 in words is "twenty billion, eight hundred seventy-three million, four hundred twenty-four thousand, one hundred eighty-one".