20673181 has 2 divisors, whose sum is σ = 20673182. Its totient is φ = 20673180.

The previous prime is 20673157. The next prime is 20673193. The reversal of 20673181 is 18137602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20169081 + 504100 = 4491^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673181 - 2⁹ = 20672669 is a prime.

It is a super-2 number, since 2×20673181² = 854760825317522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20673101) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336590 + 10336591.

It is an arithmetic number, because the mean of its divisors is an integer number (10336591).

Almost surely, 2^20673181 is an apocalyptic number.

It is an amenable number.

20673181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673181 is an equidigital number, since it uses as much as digits as its factorization.

20673181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 20673181 is about 4546.7769903526. The cubic root of 20673181 is about 274.4537077863.

The spelling of 20673181 in words is "twenty million, six hundred seventy-three thousand, one hundred eighty-one".