20115013 has 16 divisors (see below), whose sum is σ = 21669120. Its totient is φ = 18639936.

The previous prime is 20114993. The next prime is 20115023. The reversal of 20115013 is 31051102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20115013 is a prime.

It is a super-2 number, since 2×20115013² = 809227495980338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20114984 and 20115002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74643 + ... + 74911.

It is an arithmetic number, because the mean of its divisors is an integer number (1354320).

Almost surely, 2^20115013 is an apocalyptic number.

It is an amenable number.

20115013 is a deficient number, since it is larger than the sum of its proper divisors (1554107).

20115013 is a wasteful number, since it uses less digits than its factorization.

20115013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 20115013 is about 4484.9763656010. The cubic root of 20115013 is about 271.9610896258.

Adding to 20115013 its reverse (31051102), we get a palindrome (51166115).

The spelling of 20115013 in words is "twenty million, one hundred fifteen thousand, thirteen".