20116815 has 8 divisors (see below), whose sum is σ = 32186928. Its totient is φ = 10728960.

The previous prime is 20116813. The next prime is 20116841. The reversal of 20116815 is 51861102.

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

It is not a de Polignac number, because 20116815 - 2¹ = 20116813 is a prime.

It is a super-3 number, since 3×20116815³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20116813) 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, 670546 + ... + 670575.

It is an arithmetic number, because the mean of its divisors is an integer number (4023366).

Almost surely, 2^20116815 is an apocalyptic number.

20116815 is a deficient number, since it is larger than the sum of its proper divisors (12070113).

20116815 is a wasteful number, since it uses less digits than its factorization.

20116815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341129.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 20116815 is about 4485.1772540224. The cubic root of 20116815 is about 271.9692105792.

Adding to 20116815 its reverse (51861102), we get a palindrome (71977917).

The spelling of 20116815 in words is "twenty million, one hundred sixteen thousand, eight hundred fifteen".