20385105 has 32 divisors (see below), whose sum is σ = 35489664. Its totient is φ = 9931776.

The previous prime is 20385083. The next prime is 20385121. The reversal of 20385105 is 50158302.

It is not a de Polignac number, because 20385105 - 2⁷ = 20384977 is a prime.

It is a super-2 number, since 2×20385105² = 831105011722050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20377 + ... + 21353.

It is an arithmetic number, because the mean of its divisors is an integer number (1109052).

Almost surely, 2^20385105 is an apocalyptic number.

It is an amenable number.

20385105 is a deficient number, since it is larger than the sum of its proper divisors (15104559).

20385105 is a wasteful number, since it uses less digits than its factorization.

20385105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20385105 is about 4514.9867109439. The cubic root of 20385105 is about 273.1729237593.

The spelling of 20385105 in words is "twenty million, three hundred eighty-five thousand, one hundred five".