20673943 has 2 divisors, whose sum is σ = 20673944. Its totient is φ = 20673942.

The previous prime is 20673907. The next prime is 20673959. The reversal of 20673943 is 34937602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20673943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20673899 and 20673908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20673973) 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, 10336971 + 10336972.

It is an arithmetic number, because the mean of its divisors is an integer number (10336972).

Almost surely, 2^20673943 is an apocalyptic number.

20673943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673943 is an equidigital number, since it uses as much as digits as its factorization.

20673943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 20673943 is about 4546.8607852011. The cubic root of 20673943 is about 274.4570798065.

The spelling of 20673943 in words is "twenty million, six hundred seventy-three thousand, nine hundred forty-three".