20166449 has 4 divisors (see below), whose sum is σ = 20197620. Its totient is φ = 20135280.

The previous prime is 20166439. The next prime is 20166451. The reversal of 20166449 is 94466102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5726449 + 14440000 = 2393^2 + 3800^2 .

It is a cyclic number.

It is not a de Polignac number, because 20166449 - 2²⁴ = 3389233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20166439) 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, 14594 + ... + 15915.

It is an arithmetic number, because the mean of its divisors is an integer number (5049405).

Almost surely, 2^20166449 is an apocalyptic number.

It is an amenable number.

20166449 is a deficient number, since it is larger than the sum of its proper divisors (31171).

20166449 is an equidigital number, since it uses as much as digits as its factorization.

20166449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31170.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20166449 is about 4490.7069599340. The cubic root of 20166449 is about 272.1927024371.

The spelling of 20166449 in words is "twenty million, one hundred sixty-six thousand, four hundred forty-nine".