20356873 has 2 divisors, whose sum is σ = 20356874. Its totient is φ = 20356872.

The previous prime is 20356841. The next prime is 20356877. The reversal of 20356873 is 37865302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16867449 + 3489424 = 4107^2 + 1868^2 .

It is a cyclic number.

It is not a de Polignac number, because 20356873 - 2⁵ = 20356841 is a prime.

It is not a weakly prime, because it can be changed into another prime (20356877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178436 + 10178437.

It is an arithmetic number, because the mean of its divisors is an integer number (10178437).

Almost surely, 2^20356873 is an apocalyptic number.

It is an amenable number.

20356873 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356873 is an equidigital number, since it uses as much as digits as its factorization.

20356873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20356873 is about 4511.8591511704. The cubic root of 20356873 is about 273.0467567855.

The spelling of 20356873 in words is "twenty million, three hundred fifty-six thousand, eight hundred seventy-three".