20917105 has 8 divisors (see below), whose sum is σ = 27382464. Its totient is φ = 15212400.

The previous prime is 20917087. The next prime is 20917121. The reversal of 20917105 is 50171902.

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

It is not a de Polignac number, because 20917105 - 2⁵ = 20917073 is a prime.

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 20917105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190101 + ... + 190210.

It is an arithmetic number, because the mean of its divisors is an integer number (3422808).

Almost surely, 2^20917105 is an apocalyptic number.

It is an amenable number.

20917105 is a deficient number, since it is larger than the sum of its proper divisors (6465359).

20917105 is a wasteful number, since it uses less digits than its factorization.

20917105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380327.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 20917105 is about 4573.5221656837. The cubic root of 20917105 is about 275.5289214403.

The spelling of 20917105 in words is "twenty million, nine hundred seventeen thousand, one hundred five".