20663115 has 16 divisors (see below), whose sum is σ = 36066816. Its totient is φ = 10018400.

The previous prime is 20663107. The next prime is 20663147. The reversal of 20663115 is 51136602.

It is not a de Polignac number, because 20663115 - 2³ = 20663107 is a prime.

It is a super-3 number, since 3×20663115³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62451 + ... + 62780.

It is an arithmetic number, because the mean of its divisors is an integer number (2254176).

Almost surely, 2^20663115 is an apocalyptic number.

20663115 is a deficient number, since it is larger than the sum of its proper divisors (15403701).

20663115 is a wasteful number, since it uses less digits than its factorization.

20663115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125250.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20663115 is about 4545.6699176249. The cubic root of 20663115 is about 274.4091557080.

Adding to 20663115 its reverse (51136602), we get a palindrome (71799717).

The spelling of 20663115 in words is "twenty million, six hundred sixty-three thousand, one hundred fifteen".