20943667 has 2 divisors, whose sum is σ = 20943668. Its totient is φ = 20943666.

The previous prime is 20943641. The next prime is 20943683. The reversal of 20943667 is 76634902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20943667 is a prime.

It is not a weakly prime, because it can be changed into another prime (20943617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471833 + 10471834.

It is an arithmetic number, because the mean of its divisors is an integer number (10471834).

Almost surely, 2^20943667 is an apocalyptic number.

20943667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20943667 is an equidigital number, since it uses as much as digits as its factorization.

20943667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 20943667 is about 4576.4251332235. The cubic root of 20943667 is about 275.6455007264.

The spelling of 20943667 in words is "twenty million, nine hundred forty-three thousand, six hundred sixty-seven".