20166838267 has 4 divisors (see below), whose sum is σ = 20168073576. Its totient is φ = 20165602960.

The previous prime is 20166838261. The next prime is 20166838297. The reversal of 20166838267 is 76283866102.

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 20166838267 - 2³ = 20166838259 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20166838267.

It is not an unprimeable number, because it can be changed into a prime (20166838261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592834 + ... + 625927.

It is an arithmetic number, because the mean of its divisors is an integer number (5042018394).

Almost surely, 2^20166838267 is an apocalyptic number.

20166838267 is a deficient number, since it is larger than the sum of its proper divisors (1235309).

20166838267 is a wasteful number, since it uses less digits than its factorization.

20166838267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235308.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 20166838267 in words is "twenty billion, one hundred sixty-six million, eight hundred thirty-eight thousand, two hundred sixty-seven".