20161667 has 2 divisors, whose sum is σ = 20161668. Its totient is φ = 20161666.

The previous prime is 20161649. The next prime is 20161693. The reversal of 20161667 is 76616102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20161667 - 2²⁰ = 19113091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20161607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080833 + 10080834.

It is an arithmetic number, because the mean of its divisors is an integer number (10080834).

Almost surely, 2^20161667 is an apocalyptic number.

20161667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161667 is an equidigital number, since it uses as much as digits as its factorization.

20161667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20161667 is about 4490.1744954957. The cubic root of 20161667 is about 272.1711860329.

Adding to 20161667 its reverse (76616102), we get a palindrome (96777769).

The spelling of 20161667 in words is "twenty million, one hundred sixty-one thousand, six hundred sixty-seven".