20996105 has 16 divisors (see below), whose sum is σ = 28731024. Its totient is φ = 14592000.

The previous prime is 20996099. The next prime is 20996117. The reversal of 20996105 is 50169902.

It can be written as a sum of positive squares in 8 ways, for example, as 1951609 + 19044496 = 1397^2 + 4364^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20996105 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8396 + ... + 10605.

It is an arithmetic number, because the mean of its divisors is an integer number (1795689).

Almost surely, 2^20996105 is an apocalyptic number.

It is an amenable number.

20996105 is a deficient number, since it is larger than the sum of its proper divisors (7734919).

20996105 is a wasteful number, since it uses less digits than its factorization.

20996105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19036.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 20996105 is about 4582.1506959069. The cubic root of 20996105 is about 275.8753594252.

The spelling of 20996105 in words is "twenty million, nine hundred ninety-six thousand, one hundred five".