20973943 has 2 divisors, whose sum is σ = 20973944. Its totient is φ = 20973942.

The previous prime is 20973913. The next prime is 20973959. The reversal of 20973943 is 34937902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20973943 - 2⁹ = 20973431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20973913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10486971 + 10486972.

It is an arithmetic number, because the mean of its divisors is an integer number (10486972).

Almost surely, 2^20973943 is an apocalyptic number.

20973943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20973943 is an equidigital number, since it uses as much as digits as its factorization.

20973943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 20973943 is about 4579.7317607039. The cubic root of 20973943 is about 275.7782604295.

The spelling of 20973943 in words is "twenty million, nine hundred seventy-three thousand, nine hundred forty-three".