20868459 has 8 divisors (see below), whose sum is σ = 28471872. Its totient is φ = 13588680.

The previous prime is 20868457. The next prime is 20868461. The reversal of 20868459 is 95486802.

It is an interprime number because it is at equal distance from previous prime (20868457) and next prime (20868461).

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

It is not a de Polignac number, because 20868459 - 2¹ = 20868457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20868459.

It is not an unprimeable number, because it can be changed into a prime (20868451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80757 + ... + 81014.

It is an arithmetic number, because the mean of its divisors is an integer number (3558984).

Almost surely, 2^20868459 is an apocalyptic number.

20868459 is a deficient number, since it is larger than the sum of its proper divisors (7603413).

20868459 is a wasteful number, since it uses less digits than its factorization.

20868459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161817.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20868459 is about 4568.2008493498. The cubic root of 20868459 is about 275.3151604393.

The spelling of 20868459 in words is "twenty million, eight hundred sixty-eight thousand, four hundred fifty-nine".