20667145 has 8 divisors (see below), whose sum is σ = 24926400. Its totient is φ = 16449840.

The previous prime is 20667137. The next prime is 20667151. The reversal of 20667145 is 54176602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20667145 - 2³ = 20667137 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9391 + ... + 11380.

It is an arithmetic number, because the mean of its divisors is an integer number (3115800).

Almost surely, 2^20667145 is an apocalyptic number.

It is an amenable number.

20667145 is a deficient number, since it is larger than the sum of its proper divisors (4259255).

20667145 is a wasteful number, since it uses less digits than its factorization.

20667145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20975.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20667145 is about 4546.1131750101. The cubic root of 20667145 is about 274.4269942093.

The spelling of 20667145 in words is "twenty million, six hundred sixty-seven thousand, one hundred forty-five".