20863115 has 16 divisors (see below), whose sum is σ = 30813888. Its totient is φ = 13205376.

The previous prime is 20863111. The next prime is 20863123. The reversal of 20863115 is 51136802.

It is a cyclic number.

It is not a de Polignac number, because 20863115 - 2² = 20863111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20863111) 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, 22472 + ... + 23381.

It is an arithmetic number, because the mean of its divisors is an integer number (1925868).

Almost surely, 2^20863115 is an apocalyptic number.

20863115 is a deficient number, since it is larger than the sum of its proper divisors (9950773).

20863115 is a wasteful number, since it uses less digits than its factorization.

20863115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45878.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20863115 is about 4567.6158989127. The cubic root of 20863115 is about 275.2916575088.

Adding to 20863115 its reverse (51136802), we get a palindrome (71999917).

The spelling of 20863115 in words is "twenty million, eight hundred sixty-three thousand, one hundred fifteen".