20016859 has 4 divisors (see below), whose sum is σ = 20047104. Its totient is φ = 19986616.

The previous prime is 20016847. The next prime is 20016883. The reversal of 20016859 is 95861002.

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 20016859 - 2⁵ = 20016827 is a prime.

It is a super-3 number, since 3×20016859³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20016859.

It is not an unprimeable number, because it can be changed into a prime (20016839) 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, 14107 + ... + 15460.

It is an arithmetic number, because the mean of its divisors is an integer number (5011776).

Almost surely, 2^20016859 is an apocalyptic number.

20016859 is a deficient number, since it is larger than the sum of its proper divisors (30245).

20016859 is an equidigital number, since it uses as much as digits as its factorization.

20016859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30244.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20016859 is about 4474.0204514508. The cubic root of 20016859 is about 271.5180108497.

The spelling of 20016859 in words is "twenty million, sixteen thousand, eight hundred fifty-nine".