20673973 has 2 divisors, whose sum is σ = 20673974. Its totient is φ = 20673972.

The previous prime is 20673971. The next prime is 20673977. The reversal of 20673973 is 37937602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17656804 + 3017169 = 4202^2 + 1737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673973 - 2¹ = 20673971 is a prime.

Together with 20673971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20673971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336986 + 10336987.

It is an arithmetic number, because the mean of its divisors is an integer number (10336987).

Almost surely, 2^20673973 is an apocalyptic number.

It is an amenable number.

20673973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673973 is an equidigital number, since it uses as much as digits as its factorization.

20673973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 37.

The square root of 20673973 is about 4546.8640841793. The cubic root of 20673973 is about 274.4572125615.

The spelling of 20673973 in words is "twenty million, six hundred seventy-three thousand, nine hundred seventy-three".