20355105 has 16 divisors (see below), whose sum is σ = 32647680. Its totient is φ = 10829568.

The previous prime is 20355067. The next prime is 20355107. The reversal of 20355105 is 50155302.

It is not a de Polignac number, because 20355105 - 2⁸ = 20354849 is a prime.

It is a super-2 number, since 2×20355105² = 828660599122050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20355107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5769 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (2040480).

Almost surely, 2^20355105 is an apocalyptic number.

It is an amenable number.

20355105 is a deficient number, since it is larger than the sum of its proper divisors (12292575).

20355105 is a wasteful number, since it uses less digits than its factorization.

20355105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 20355105 is about 4511.6632188141. The cubic root of 20355105 is about 273.0388518281.

It can be divided in two parts, 2035 and 5105, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 20355105 in words is "twenty million, three hundred fifty-five thousand, one hundred five".