20865379 has 8 divisors (see below), whose sum is σ = 21189168. Its totient is φ = 20544000.

The previous prime is 20865367. The next prime is 20865389. The reversal of 20865379 is 97356802.

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

It is a cyclic number.

It is not a de Polignac number, because 20865379 - 2²³ = 12476771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20865319) by changing a digit.

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, 23919 + ... + 24775.

It is an arithmetic number, because the mean of its divisors is an integer number (2648646).

Almost surely, 2^20865379 is an apocalyptic number.

20865379 is a deficient number, since it is larger than the sum of its proper divisors (323789).

20865379 is an equidigital number, since it uses as much as digits as its factorization.

20865379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20865379 is about 4567.8637238867. The cubic root of 20865379 is about 275.3016150785.

The spelling of 20865379 in words is "twenty million, eight hundred sixty-five thousand, three hundred seventy-nine".