20166667 has 2 divisors, whose sum is σ = 20166668. Its totient is φ = 20166666.

The previous prime is 20166649. The next prime is 20166683. The reversal of 20166667 is 76666102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20166667 is a prime.

It is not a weakly prime, because it can be changed into another prime (20166617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083333 + 10083334.

It is an arithmetic number, because the mean of its divisors is an integer number (10083334).

Almost surely, 2^20166667 is an apocalyptic number.

20166667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166667 is an equidigital number, since it uses as much as digits as its factorization.

20166667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20166667 is about 4490.7312322160. The cubic root of 20166667 is about 272.1936832377.

The spelling of 20166667 in words is "twenty million, one hundred sixty-six thousand, six hundred sixty-seven".