20730105 has 24 divisors (see below), whose sum is σ = 39199680. Its totient is φ = 10050720.

The previous prime is 20730079. The next prime is 20730109. The reversal of 20730105 is 50103702.

It is not a de Polignac number, because 20730105 - 2¹⁵ = 20697337 is a prime.

It is a super-2 number, since 2×20730105² = 859474506622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20730109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20445 + ... + 21434.

It is an arithmetic number, because the mean of its divisors is an integer number (1633320).

Almost surely, 2^20730105 is an apocalyptic number.

It is an amenable number.

20730105 is a deficient number, since it is larger than the sum of its proper divisors (18469575).

20730105 is a wasteful number, since it uses less digits than its factorization.

20730105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41901 (or 41898 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20730105 is about 4553.0325059239. The cubic root of 20730105 is about 274.7053814457.

Adding to 20730105 its reverse (50103702), we get a palindrome (70833807).

The spelling of 20730105 in words is "twenty million, seven hundred thirty thousand, one hundred five".