20680943 has 2 divisors, whose sum is σ = 20680944. Its totient is φ = 20680942.

The previous prime is 20680931. The next prime is 20680963. The reversal of 20680943 is 34908602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20680943 - 2⁴ = 20680927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20680903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10340471 + 10340472.

It is an arithmetic number, because the mean of its divisors is an integer number (10340472).

Almost surely, 2^20680943 is an apocalyptic number.

20680943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20680943 is an equidigital number, since it uses as much as digits as its factorization.

20680943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20680943 is about 4547.6304819103. The cubic root of 20680943 is about 274.4880524946.

The spelling of 20680943 in words is "twenty million, six hundred eighty thousand, nine hundred forty-three".