20708999 has 8 divisors (see below), whose sum is σ = 21216000. Its totient is φ = 20204856.

The previous prime is 20708971. The next prime is 20709041. The reversal of 20708999 is 99980702.

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 20708999 - 2¹² = 20704903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708969) 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 7 ways as a sum of consecutive naturals, for example, 23012 + ... + 23894.

It is an arithmetic number, because the mean of its divisors is an integer number (2652000).

Almost surely, 2^20708999 is an apocalyptic number.

20708999 is a deficient number, since it is larger than the sum of its proper divisors (507001).

20708999 is an equidigital number, since it uses as much as digits as its factorization.

20708999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 20708999 is about 4550.7141197838. The cubic root of 20708999 is about 274.6121209343.

The spelling of 20708999 in words is "twenty million, seven hundred eight thousand, nine hundred ninety-nine".