20899105 has 8 divisors (see below), whose sum is σ = 25108200. Its totient is φ = 16699776.

The previous prime is 20899093. The next prime is 20899121. The reversal of 20899105 is 50199802.

It can be written as a sum of positive squares in 4 ways, for example, as 613089 + 20286016 = 783^2 + 4504^2 .

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 20899105 - 2¹¹ = 20897057 is a prime.

It is an unprimeable number.

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, 3661 + ... + 7429.

It is an arithmetic number, because the mean of its divisors is an integer number (3138525).

Almost surely, 2^20899105 is an apocalyptic number.

It is an amenable number.

20899105 is a deficient number, since it is larger than the sum of its proper divisors (4209095).

20899105 is a wasteful number, since it uses less digits than its factorization.

20899105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4883.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 20899105 is about 4571.5538933715. The cubic root of 20899105 is about 275.4498642303.

The spelling of 20899105 in words is "twenty million, eight hundred ninety-nine thousand, one hundred five".