20390105 has 8 divisors (see below), whose sum is σ = 24883200. Its totient is φ = 16035376.

The previous prime is 20390081. The next prime is 20390113. The reversal of 20390105 is 50109302.

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 20390105 - 2¹⁰ = 20389081 is a prime.

It is a super-2 number, since 2×20390105² = 831512763822050, which contains 22 as substring.

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, 34265 + ... + 34854.

It is an arithmetic number, because the mean of its divisors is an integer number (3110400).

Almost surely, 2^20390105 is an apocalyptic number.

It is an amenable number.

20390105 is a deficient number, since it is larger than the sum of its proper divisors (4493095).

20390105 is an equidigital number, since it uses as much as digits as its factorization.

20390105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69183.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 20390105 is about 4515.5403884807. The cubic root of 20390105 is about 273.1952562902.

Adding to 20390105 its reverse (50109302), we get a palindrome (70499407).

The spelling of 20390105 in words is "twenty million, three hundred ninety thousand, one hundred five".