20487167 has 4 divisors (see below), whose sum is σ = 20986896. Its totient is φ = 19987440.

The previous prime is 20487163. The next prime is 20487211. The reversal of 20487167 is 76178402.

It is a happy number.

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 20487167 - 2² = 20487163 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487161) 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, 249803 + ... + 249884.

It is an arithmetic number, because the mean of its divisors is an integer number (5246724).

Almost surely, 2^20487167 is an apocalyptic number.

20487167 is a deficient number, since it is larger than the sum of its proper divisors (499729).

20487167 is an equidigital number, since it uses as much as digits as its factorization.

20487167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499728.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20487167 is about 4526.2751794384. The cubic root of 20487167 is about 273.6280628440.

The spelling of 20487167 in words is "twenty million, four hundred eighty-seven thousand, one hundred sixty-seven".