20955173 has 2 divisors, whose sum is σ = 20955174. Its totient is φ = 20955172.

The previous prime is 20955167. The next prime is 20955199. The reversal of 20955173 is 37155902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 4169764 = 4097^2 + 2042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20955173 is a prime.

It is equal to p_1327289 and since 20955173 and 1327289 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20955113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477586 + 10477587.

It is an arithmetic number, because the mean of its divisors is an integer number (10477587).

Almost surely, 2^20955173 is an apocalyptic number.

It is an amenable number.

20955173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955173 is an equidigital number, since it uses as much as digits as its factorization.

20955173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 20955173 is about 4577.6820553638. The cubic root of 20955173 is about 275.6959693877.

The spelling of 20955173 in words is "twenty million, nine hundred fifty-five thousand, one hundred seventy-three".