20105473 has 4 divisors (see below), whose sum is σ = 20979648. Its totient is φ = 19231300.

The previous prime is 20105447. The next prime is 20105479. The reversal of 20105473 is 37450102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20105473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20105479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437053 + ... + 437098.

It is an arithmetic number, because the mean of its divisors is an integer number (5244912).

Almost surely, 2^20105473 is an apocalyptic number.

20105473 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20105473 is a deficient number, since it is larger than the sum of its proper divisors (874175).

20105473 is an equidigital number, since it uses as much as digits as its factorization.

20105473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874174.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20105473 is about 4483.9126887128. The cubic root of 20105473 is about 271.9180882604.

Adding to 20105473 its reverse (37450102), we get a palindrome (57555575).

The spelling of 20105473 in words is "twenty million, one hundred five thousand, four hundred seventy-three".