20426667 has 4 divisors (see below), whose sum is σ = 27235560. Its totient is φ = 13617776.

The previous prime is 20426647. The next prime is 20426689. The reversal of 20426667 is 76662402.

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

It is a cyclic number.

It is not a de Polignac number, because 20426667 - 2⁶ = 20426603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20426647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3404442 + ... + 3404447.

It is an arithmetic number, because the mean of its divisors is an integer number (6808890).

Almost surely, 2^20426667 is an apocalyptic number.

20426667 is a deficient number, since it is larger than the sum of its proper divisors (6808893).

20426667 is an equidigital number, since it uses as much as digits as its factorization.

20426667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6808892.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20426667 is about 4519.5870386574. The cubic root of 20426667 is about 273.3584498369.

The spelling of 20426667 in words is "twenty million, four hundred twenty-six thousand, six hundred sixty-seven".