20206667 has 4 divisors (see below), whose sum is σ = 21761040. Its totient is φ = 18652296.

The previous prime is 20206661. The next prime is 20206687. The reversal of 20206667 is 76660202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20206667 - 2⁴ = 20206651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20206661) 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 in 3 ways as a sum of consecutive naturals, for example, 777167 + ... + 777192.

It is an arithmetic number, because the mean of its divisors is an integer number (5440260).

Almost surely, 2^20206667 is an apocalyptic number.

20206667 is a deficient number, since it is larger than the sum of its proper divisors (1554373).

20206667 is a wasteful number, since it uses less digits than its factorization.

20206667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554372.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20206667 is about 4495.1826436753. The cubic root of 20206667 is about 272.3735271478.

Adding to 20206667 its reverse (76660202), we get a palindrome (96866869).

The spelling of 20206667 in words is "twenty million, two hundred six thousand, six hundred sixty-seven".