20150115 has 8 divisors (see below), whose sum is σ = 32240208. Its totient is φ = 10746720.

The previous prime is 20150111. The next prime is 20150131. The reversal of 20150115 is 51105102.

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

It is not a de Polignac number, because 20150115 - 2² = 20150111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1343341 = 20150115 / (2 + 0 + 1 + 5 + 0 + 1 + 1 + 5).

It is a junction number, because it is equal to n+sod(n) for n = 20150094 and 20150103.

It is not an unprimeable number, because it can be changed into a prime (20150111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671656 + ... + 671685.

It is an arithmetic number, because the mean of its divisors is an integer number (4030026).

Almost surely, 2^20150115 is an apocalyptic number.

20150115 is a deficient number, since it is larger than the sum of its proper divisors (12090093).

20150115 is a wasteful number, since it uses less digits than its factorization.

20150115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343349.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 20150115 is about 4488.8879469196. The cubic root of 20150115 is about 272.1191942635.

Adding to 20150115 its reverse (51105102), we get a palindrome (71255217).

The spelling of 20150115 in words is "twenty million, one hundred fifty thousand, one hundred fifteen".