20150105 has 8 divisors (see below), whose sum is σ = 24258312. Its totient is φ = 16067968.

The previous prime is 20150087. The next prime is 20150111. The reversal of 20150105 is 50105102.

It can be written as a sum of positive squares in 4 ways, for example, as 2062096 + 18088009 = 1436^2 + 4253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20150105 is a prime.

It is a super-2 number, since 2×20150105² = 812053463022050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20150105.

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, 4772 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (3032289).

Almost surely, 2^20150105 is an apocalyptic number.

It is an amenable number.

20150105 is a deficient number, since it is larger than the sum of its proper divisors (4108207).

20150105 is a wasteful number, since it uses less digits than its factorization.

20150105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13035.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 20150105 is about 4488.8868330578. The cubic root of 20150105 is about 272.1191492482.

Adding to 20150105 its reverse (50105102), we get a palindrome (70255207).

The spelling of 20150105 in words is "twenty million, one hundred fifty thousand, one hundred five".