20105224 has 8 divisors (see below), whose sum is σ = 37697310. Its totient is φ = 10052608.

The previous prime is 20105221. The next prime is 20105227. The reversal of 20105224 is 42250102.

It is an interprime number because it is at equal distance from previous prime (20105221) and next prime (20105227).

It can be written as a sum of positive squares in only one way, i.e., 20088324 + 16900 = 4482^2 + 130^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20105198 and 20105207.

It is not an unprimeable number, because it can be changed into a prime (20105221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1256569 + ... + 1256584.

Almost surely, 2^20105224 is an apocalyptic number.

It is an amenable number.

20105224 is a deficient number, since it is larger than the sum of its proper divisors (17592086).

20105224 is a wasteful number, since it uses less digits than its factorization.

20105224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513159 (or 2513155 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20105224 is about 4483.8849226982. The cubic root of 20105224 is about 271.9169657156.

Adding to 20105224 its reverse (42250102), we get a palindrome (62355326).

The spelling of 20105224 in words is "twenty million, one hundred five thousand, two hundred twenty-four".