20101015 has 8 divisors (see below), whose sum is σ = 26314128. Its totient is φ = 14618880.

The previous prime is 20101013. The next prime is 20101073. The reversal of 20101015 is 51010102.

It is a happy number.

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

It is not a de Polignac number, because 20101015 - 2¹ = 20101013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100992 and 20101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101013) 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, 182682 + ... + 182791.

It is an arithmetic number, because the mean of its divisors is an integer number (3289266).

Almost surely, 2^20101015 is an apocalyptic number.

20101015 is a deficient number, since it is larger than the sum of its proper divisors (6213113).

20101015 is a wasteful number, since it uses less digits than its factorization.

20101015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365489.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 20101015 is about 4483.4155506712. The cubic root of 20101015 is about 271.8979892482.

Adding to 20101015 its reverse (51010102), we get a palindrome (71111117).

It can be divided in two parts, 2010 and 1015, that added together give a square (3025 = 55²).

The spelling of 20101015 in words is "twenty million, one hundred one thousand, fifteen".