20867387 has 4 divisors (see below), whose sum is σ = 20950776. Its totient is φ = 20784000.

The previous prime is 20867369. The next prime is 20867411. The reversal of 20867387 is 78376802.

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 20867387 - 2⁸ = 20867131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20867317) 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, 41318 + ... + 41819.

It is an arithmetic number, because the mean of its divisors is an integer number (5237694).

Almost surely, 2^20867387 is an apocalyptic number.

20867387 is a deficient number, since it is larger than the sum of its proper divisors (83389).

20867387 is an equidigital number, since it uses as much as digits as its factorization.

20867387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83388.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 20867387 is about 4568.0835149984. The cubic root of 20867387 is about 275.3104461013.

The spelling of 20867387 in words is "twenty million, eight hundred sixty-seven thousand, three hundred eighty-seven".