20105474 has 4 divisors (see below), whose sum is σ = 30158214. Its totient is φ = 10052736.

The previous prime is 20105447. The next prime is 20105479. The reversal of 20105474 is 47450102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15547249 + 4558225 = 3943^2 + 2135^2 .

It is a Curzon 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 as a sum of consecutive naturals, namely, 5026367 + ... + 5026370.

Almost surely, 2^20105474 is an apocalyptic number.

20105474 is a deficient number, since it is larger than the sum of its proper divisors (10052740).

20105474 is a wasteful number, since it uses less digits than its factorization.

20105474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052739.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20105474 is about 4483.9128002226. The cubic root of 20105474 is about 271.9180927686.

Adding to 20105474 its reverse (47450102), we get a palindrome (67555576).

The spelling of 20105474 in words is "twenty million, one hundred five thousand, four hundred seventy-four".